I just ask interviewers what the point of these questions is now.
If you can't give someone an interview with relevant questions, how can you justify not hiring the candidate? AFAIK at least in the UK candidates have a legal right to know why they weren't selected to make sure it wasn't based on prejudices, etc. So if your response is "you didn't do something that we both knew from your CV you never claimed to do", that sounds immediately unfair.