JSFiddle - React, Tailwind, and code Playground

HTML

<form action="?" method="post">
<select class='css-class'>
<option value=''>choose</option>
<option value='1' data-key='1'>one</option>
<option value='2' data-key='2'>two</option>   
<input type="submit"/>
</select>
</form>

CSS

.css-class select option{
     /* anything here to make it required */
}