Everyone knows that there is Central Park in NY.. Remember, if you don't know anything about the subject, state it clearly to your interviewer. This is way better than assuming things when you have zero knowledge.Summing up, my approach is:1. Asking for precise information2. If the interviewer gives me the info I need, then I'm fine3. If the interviewer wants me to make assumptions, I will make them relying on my knowledge4. If I don't know anything, before starting with assumptions I will say to the interviewer "Since I don't know anything about this topic, would you explain me sth?"