This is a very difficult piece of advice to give. Firstly there is no real correct answer, because if you do not know the answer to a question, either because you lack the requisite knowledge, the interviewer has asked the most ridiculous question or you are so nervous about the interview your brain has fried and are panicking. The first instance, if you do not the answer because you do not have the knowledge to answer the question, it is often best to take a little bit of time to think about whether you can come up with an answer that perhaps is somewhat vague or bluffed, and a good way of doing this is to ask for a glass of water. Have a sip of the water whilst you think about it. If nothing is forthcoming afterwards, you then have to move on to plan B. You can also consider simply saying, I’m afraid I don’t know the answer to that, and if it is a question that would require knowledge of some sort, you could perhaps say, if I was in practice or if I was in a work environment, I would...
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