Identificar um com jQuery

(function ($) {

    $.fn.niceSelect = function () {

        // Hide native select
        this.hide();

        // Create custom markup
        this.each(function () {
            var $select = $(this);

            if (!$select.next().hasClass('nice-select')) {
                create_nice_select($select);
            }
        });

        function create_nice_select($select) {
            $select.after($('<div></div>')
                    .addClass('nice-select')
                    .addClass($select.attr('class') || '')
                    .addClass($select.attr('disabled') ? 'disabled' : '')
                    .attr('tabindex', $select.attr('disabled') ? null : '0')
                    .html('<span class="current"></span><ul class="list"></ul>')
                    );

            var $dropdown = $select.next();
            var $options = $select.find('option');
            var $optgroups = $select.find('optgroup');
            var $selected = $select.find('option:selected');

            $dropdown.find('.current').html($selected.data('display') || $selected.text());

            $options.each(function () {
                var $option = $(this);
                var display = $option.data('display');
                var group = $option.parents('optgroup').data('i');

                $dropdown.find('ul').append($('<li></li>')
                        .attr('data-value', $option.val())
                        .attr('data-display', (display || null))
                        .attr('data-group', (group || null))
                        .addClass('option' +
                                ($option.is(':selected') ? ' selected' : '') +
                                ($option.is(':disabled') ? ' disabled' : ''))
                        .html($option.text())
                        );
            });
            $optgroups.each(function(i, g) {
              label = $(g).attr('label');
              $dropdown.find('ul li').filter(function() {
                return $(this).data('group') === $(g).data('i');
              })
              .wrapAll('<div class="optgroup"/>')
              .parent()
              .prepend('<span class="label">' + label + '</span>');
            });
        }

        /* Event listeners */
        // Unbind existing events in case that the plugin has been initialized before
        $(document).off('.nice_select');

        // Open/close
        $(document).on('click.nice_select', '.nice-select', function () {
            var $dropdown = $(this);

            $('.nice-select').not($dropdown).removeClass('open');
            $dropdown.toggleClass('open');

            if ($dropdown.hasClass('open')) {
                $dropdown.find('.option');
                $dropdown.find('.focus').removeClass('focus');
                $dropdown.find('.selected').addClass('focus');
            } else {
                $dropdown.focus();
            }
        });

        // Close when clicking outside
        $(document).on('click.nice_select', function (event) {

            if ($(event.target).closest('.nice-select').length === 0) {
                $('.nice-select').removeClass('open').find('.option');
            }
        });

        // Animation loading a page
        $('select').on('blur', function (e) {
            $(this).parents('.form-group-select').toggleClass('focused', (e.type === 'focus' || this.value !== ''));
        }).trigger('blur');

        // Option click
        $(document).on('click.nice_select', '.nice-select .option:not(.disabled)', function () {

            var $option = $(this);
            var $dropdown = $option.closest('.nice-select');

            $dropdown.find('.selected').removeClass('selected');
            $option.addClass('selected');

            var text = $option.data('display') || $option.text();
            $dropdown.find('.current').text(text);

            $dropdown.prev('select').val($option.data('value')).trigger('change');

            // Animation
            $(this).parents('.form-group-select').toggleClass('focused', ($option.data('value') !== ''));
        });

        // Keyboard events
        $(document).on('keydown.nice_select', '.nice-select', function (event) {

            var $dropdown = $(this);
            var $focused_option = $($dropdown.find('.focus') || $dropdown.find('.list .option.selected'));

            // Space or Enter
            if (event.keyCode === 32 || event.keyCode === 13) {
                if ($dropdown.hasClass('open')) {
                    $focused_option.trigger('click');
                } else {
                    $dropdown.trigger('click');
                }
                return false;

                // Down
            } else if (event.keyCode === 40) {
                if (!$dropdown.hasClass('open')) {
                    $dropdown.trigger('click');
                } else {
                    var $next = $focused_option.nextAll('.option:not(.disabled)').first();
                    if ($next.length > 0) {
                        $dropdown.find('.focus').removeClass('focus');
                        $next.addClass('focus');
                    }
                }
                return false;

                // Up
            } else if (event.keyCode === 38) {
                if (!$dropdown.hasClass('open')) {
                    $dropdown.trigger('click');
                } else {
                    var $prev = $focused_option.prevAll('.option:not(.disabled)').first();
                    if ($prev.length > 0) {
                        $dropdown.find('.focus').removeClass('focus');
                        $prev.addClass('focus');
                    }
                }
                return false;

                // Esc
            } else if (event.keyCode === 27) {
                if ($dropdown.hasClass('open')) {
                    $dropdown.trigger('click');
                }

                // Tab
            } else if (event.keyCode === 9) {
                if ($dropdown.hasClass('open')) {
                    return false;
                }
            }
        });
        return this;
    };
}(jQuery));
$('select').niceSelect();

.control-label {
    pointer-events: none;
    position: absolute;
    transform: translate3d(5px, 22px, 0) scale(1);
    transform-origin: left top;
    transition: 240ms;
}.form-group-select.focused .control-label {
    transform: scale(0.75);
}
.form-group-select {
    width: 100%;
    margin-top: 20px;
    position: relative;
    height: 45px;
    float: left;
}
.nice-select:before {
    width: 100%;
    height: 1px;
    background: #0091FF;
    position: absolute;
    left: 0;
    bottom: 0;
    content: '';
    transform: scaleX(0);
    transition: ease-in-out 240ms all;
}
.nice-select.open::before {
    transform: scaleX(1);
}
.nice-select {
    -webkit-tap-highlight-color: transparent;
    box-sizing: border-box;
    clear: both;
    cursor: pointer;
    display: block;
    height: 42px;
    line-height: 40px;
    outline: none;
    position: relative;
    text-align: left !important;
    -webkit-transition: all 0.2s ease-in-out;
    transition: all 0.2s ease-in-out;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    white-space: nowrap;
    width: 100%;
    border: 0 solid #484848;
    border-bottom-width: 1px;
    margin-top: 3px;
}
.nice-select span {
    margin-left: 5px;
}
.nice-select:hover, .nice-select:focus {
    border-color: #0091FF;
}
.nice-select:after {
    border-bottom: 2px solid #484848;
    border-right: 2px solid #484848;
    content: '';
    display: block;
    height: 5px;
    margin-top: -4px;
    pointer-events: none;
    position: absolute;
    right: 12px;
    top: 50%;
    -webkit-transform-origin: 66% 66%;
    -ms-transform-origin: 66% 66%;
    transform-origin: 66% 66%;
    -webkit-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    transform: rotate(45deg);
    -webkit-transition: all 0.15s ease-in-out;
    transition: all 0.15s ease-in-out;
    width: 5px;
}
.nice-select.open:after {
    -webkit-transform: rotate(-135deg);
    -ms-transform: rotate(-135deg);
    transform: rotate(-135deg);
}
.nice-select.open .list {
    color: #484848;
    opacity: 1;
    pointer-events: auto;
    -webkit-transform: scale(1) translateY(0);
    -ms-transform: scale(1) translateY(0);
    transform: scale(1) translateY(0);
}
.nice-select.disabled {
    border-color: #ededed;
    color: #999;
    pointer-events: none;
}
.nice-select.disabled:after {
    border-color: #cccccc;
}
.nice-select .list {
    background-color: #FFF;
    border-radius: 4px;
    box-sizing: border-box;
    margin-top: 4px;
    opacity: 0;
    overflow: hidden;
    padding: 0;
    pointer-events: none;
    position: absolute;
    top: 100%;
    left: 0;
    -webkit-transform-origin: 50% 0;
    -ms-transform-origin: 50% 0;
    transform-origin: 50% 0;
    -webkit-transform: scale(0.75) translateY(-21px);
    -ms-transform: scale(0.75) translateY(-21px);
    transform: scale(0.75) translateY(-21px);
    -webkit-transition: all 0.2s cubic-bezier(0.5, 0, 0, 1.25), opacity 0.15s ease-out;
    transition: all 0.2s cubic-bezier(0.5, 0, 0, 1.25), opacity 0.15s ease-out;
    width: 100%;
    z-index: 99;
}
.nice-select .list:before {
    content: '';
    display: block;
    height: 7px;
    border-radius: 4px 4px 0px 0px;
}
.nice-select .list:after {
    content: '';
    display: block;
    height: 7px;
    border-radius: 0px 0px 4px 4px;
}
.nice-select .option {
    cursor: pointer;
    line-height: 40px;
    list-style: none;
    min-height: 40px;
    outline: none;
    padding-left: 18px;
    padding-right: 29px;
    text-align: left;
    border-left: 7px solid #FFF;
}
.nice-select .option:hover {
    background-color: #000;
    background: #EEEEEE;
    border-left: 7px solid #F65314;
}
.nice-select .option.selected {
    font-weight: bold;
}
.nice-select .option.disabled {
    background-color: transparent;
    color: #999;
    cursor: default;
}
.no-csspointerevents .nice-select .list {
    display: none;
}
.no-csspointerevents .nice-select.open .list {
    display: block;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class='form-group-select'>
  <label class='control-label'>GOSTOU?</label>
  <select name='gostou'>
                    <option value=""></option>
                    <optgroup label='PRODUTOS' data-i="1">
                        <option value="s">SIM</option>
                        <option value="n">NÃO</option>
                         <optgroup label='PRODUTOS' data-i="2">
                        <option value="s">SIM</option>
                        <option value="n">NÃO</option>
                </select>
</div>