JSFiddle - React, Tailwind, and code Playground

HTML

<select runat="server" id="QuestnType" CssClass="form">
    <option value="1">Check Boxes</option>
    <option value="2">Drop Down</option>
    <option value="3">Open Ended</option>
    <option value="4">Radio Buttons</option>
</select>
<div id="answer_wrapper">
    some code here
</div>

JavaScript

$(function () 
{
    $("#QuestnType").change(function () 
    {
        ToggleDropdown();
    });
    ToggleDropdown(); 
});
function ToggleDropdown() 
{
    
    if ($("#QuestnType").val() === "3") 
    {
       
        $("#answer_wrapper").show();
    }
    else 
    {
        
        $("#answer_wrapper").hide();
    }
 };