<select id="id_category" class="big-text-box form-control" name="category">

    <option value="1">option 1</option>
    <option value="2">option 2</option>
    <option value="3">option 3</option>

</select>

<div id="category-custom-fields-container">
    <div div_id="t-field-label-27">
        <strong>Urgent Response</strong>
        <span class="errors_t-cf-27 xhr_errors"></span>
    </div>
</div>