How to change selected menu option using jquery

How to change selected menu option using jquery

HTML

<select id="second" class="chzn-select" style="width: 100px">
    <option value="1">mr</option>
    <option value="2">mrs</option>
</select>
<select id="gender" class="chzn-select" style="width: 100px">
    <option value="1">male</option>
    <option value="2">female</option>
</select>

JavaScript

$(document).ready(function () {
        $('.chzn-select').change(function () {
            $('.chzn-select').val(2).trigger('change');
        });
    });