JSFiddle - React, Tailwind, and code Playground

HTML

<select>
        <optgroup id='111' label="111" style="display:none"></optgroup>
        <option value="111">111</option> 
        <optgroup id='222' label="222" style="display:none"></optgroup>
        <option value="222">222</option> 
    </select>

JavaScript

$('select').on('change',function(){
    $('optgroup').hide();
    $('select option').show();
    $('select option:selected').hide();
    $('#'+$('select option:selected').val() ).show();
})   ;