JSFiddle - React, Tailwind, and code Playground
HTML
<form action="">
<select id='select'>
<option value='one' selected=true>One</option>
<option value='two'>Two</option>
<option value='three'>Three</option>
</select>
</form>
<button onclick='javascript:document.getElementById("select").options[0].selected=true'>Set to default</button>