JSFiddle - React, Tailwind, and code Playground
HTML
<form>
<select>
<option value="try">Trying It Yourself</option>
<option value="research">Doing Research To Learn</option>
<option value="other">Other</option>
</select>
<input type="text" name="other-field">
</form>
JavaScript
var select = $("select"),
input = $("input").hide();
select.change(function(e) {
input[select.val() == "other" ? "show" : "hide"]();
});