JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">
<select>
        <option value="English">English</option>
        <option value="English">English</option>
        <option value="English">English</option>
        <option value="Geology">Geology</option>
        <option value="Geology">Geology</option>
        <option value="Information Technology">Information Technology</option>
        <option value="Music">Music</option>
        <option value="Music">Music</option>
        <option value="Zoology">Zoology</option>
</select>

JavaScript

$('select option').each(function() {
  $(this).prevAll('option[value="' + this.value + '"]').remove();
});