Select radio button randomly

Hi guys,
I have a page with three questions with choices in radio buttons. I am trying to select the radio button randomly, but I my code is not working as I am expecting.

for the first question:
<input class="CommentRequired14256_0" type="radio" name="question_answer[14256]" value="42584" />
			<span class="answerText">Answer1</span>
<input class="CommentRequired14256_0" type="radio" name="question_answer[14256]" value="42585" />
			<span class="answerText">Answer2</span>
<input class="CommentRequired14256_0" type="radio" name="question_answer[14256]" value="42586" />
			<span class="answerText">Answer3</span>

for the second question:
<input class="CommentRequired14259_0" type="radio" name="question_answer[14259]" value="42597" />
			<span class="answerText">Answer1</span>
<input class="CommentRequired14259_0" type="radio" name="question_answer[14259]" value="42598" />
			<span class="answerText">Answer1</span>
<input class="CommentRequired14259_0" type="radio" name="question_answer[14259]" value="42599" />
			<span class="answerText">Answer1</span>

 Dim num As Integer = 0
            For Each curElement As HtmlElement In WebBrowser1.document.GetElementsByTagName("input")
                             If curElement.Name.Contains("question_answer") Then
                    If curElement.GetAttribute("type") = "radio" Then
                            curElement.Focus()
                            curElement.InvokeMember("Click")
                        End If
end if 
next

That clicks the last one. I noticed that every question has different number in the name, I am thinking about somehow track the loop and go back and click if different. Any help would be appreciated />/>