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

$(function(ready){
    $('.titleother').change(function() {
        if ($(this).val() == 'Other') {
            $('.hiddentext').show();   
        }
    });
});