JSFiddle - React, Tailwind, and code Playground

HTML

<form>
    <!-- some input fields here -->
    <select id="gender" name="gender">
        <option selected="selected" disabled="disabled">Gender?</option>
        <option>Male</option>
        <option>Female</option>
    </select>
</form>

JavaScript

$("#gender").change(function() {
    if($("#gender").val() == "Male")
    {
        alert("You're male");
    }
    else
    {
        alert("You're female");
    }
});