You do not have to answer questions you feel uncomfortable answering, and you can say you will only answer questions on a specific topic.
Qasab maaha inaad ka jawaabtid wixii su'aalo ah ee aadan rabin inaad ka jawaabto, waxaanad odhan kartaa inaad rabto inaad ka jawaabto kaliya su'aalaha ku saabsan mawduuc gaar ah.