How do you respond when you don't know the answer to a question? Basically, I would say re-state the question, have a chance to actually think about it for the most part as well. So, for the most part, if I don't know the answer to a question, either restate the question, if not, ask one of my colleagues, see if they know the answer to the question as well. Make sure the question is being answered as soon as possible.