JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-2.2.1.min.js"></script>
<input type='radio' name='ans' value='0'> <span>Dog</span>
<input type='radio' name='ans' value='1'> <span>Horse</span>
<input type='radio' name='ans' value='2'> <span>Cat</span>
<input type='radio' name='ans' value='3'> <span>Camel</span>

<input type="button" value="Change Color" id="changeColor" />

JavaScript

$(document).ready(function() {
 var changeColor = function() {
 	$('input[name=ans]').next().css('color', 'black');
 $('input[name=ans]').each(function(){
 _this = $(this);
 if(_this.is(':checked') == true) {
   _this.next().css('color', 'green');
  }
 });
}
	$('#changeColor').click(function(){
   changeColor();
  });
});