[jQuery] Grouping Definition list items

[macgregor]

I have a survey marked up with a definition list like so:

<dl>
        <dt>Question 1</dt>
        <dd>Answer 1<input type="radio" /></dd>
        <dd class="comments">Answer 2<input type="radio" /></dd>
        <dd class="feedback">
                <textarea></textarea>
        </dd>
        <dt>Question 2</dt>
        <dd>Answer 1<input type="radio" /></dd>
        <dd>Answer 2<input type="radio" /></dd>
        <dd class="comments">Answer 3<input type="radio" /></dd>
        <dd class="feedback">
                <textarea></textarea>
        </dd>
</dl>


Is there any way to select the dd elements for a particular dt? I
would like to be able to show/hide the textarea when the radio button
inside dd.comments is clicked/selected.