<form>
    <fieldset>
        <legend>Choose your favorite monster</legend>

        <input type="radio" id="kraken" name="monster">
        <label for="kraken">Kraken</label><br/>

        <input type="radio" id="sasquatch" name="monster">
        <label for="sasquatch">Sasquatch</label><br/>

        <input type="radio" id="mothman" name="monster">
        <label for="mothman">Mothman</label>
    </fieldset>
</form>

Output