JSFiddle - React, Tailwind, and code Playground

HTML

<select class="titleother">​
<option value="1">1</option>
<option value="2">2</option>
<option value="Other">Other</option>
</select>

<p class="hiddentext" style="display:none">TEXT</p>

JavaScript

$(document).ready(function()
                  {
                      $('.titleother').change(function() {

if ($('.titleother').val() == 'Other') {
    ​$('.hiddentext').css('display','block');
}​​​

});
    });