Okay, when I do not know an answer to a question, I would definitely try asking to repeat the question for me to understand it. I would try to figure out what they mean so I can try to figure out what to respond back to them. I would ask for clarification for more explaining of the question so I can fully understand what I am responding to that question. I would definitely not say I am unsure or I don't have a response to that question. I would try to get clarification of what they're meaning by asking that question so I can go ahead and think about the answer before speaking it.