JSFiddle - React, Tailwind, and code Playground

HTML

<select id="myoptions">
    
</select>

<input type="button" onclick="alert(document.getElementById('myoptions').selectedIndex)" value="Click here" />

JavaScript

var x = "Jenny,John,Stephanie,Marc,Ryan,Jessica";

var options = x.split(",");

var select = document.getElementById('myoptions');
for(var i=0; i<options.length; i++)
  select.options[i] = new Option(options[i], i);