JSFiddle - React, Tailwind, and code Playground

HTML

<select id="combo" name="combo">
    <option value=""></option>
    <option value="A">A problem</option>
    <option value="B">B problem</option>
    <option value="C">C problem</option>
    <option value="D">D problem</option>
    <option value="E">E problem</option>
</select>

JavaScript

$(document).ready(function(){
    $("#combo").change(function(){
        var $comboValue = $(this).val();
        if($comboValue == "A"){
         
            //Dynamically create the textbox
            var $template = "<input type='text' name='HOLYDAY' id='HOLYDAY' placeholder='HOLYDAY' />";
            
            $(this).parent().append($template);
        } else {
            $("#HOLYDAY").remove();   
        }
    });
});