[Plugin: cformsII – contact form] Validation of Radio Buttons

I have a form with a simple selection of a pair of radio buttons (true or false).

I would like to have the following validation occur:

if the user selects the incorrect answer and submits the form, the form throws an error indicating the user has supplied an incorrect answer.

This ensures the user can only successfully submit the form if the correct radio button selection has been made.

Any help would how to achieve this would be great!

https://www.ads-software.com/extend/plugins/cforms/