Typically if someone asks me a very off key question like this, I assume it’s because they want to be asked that question in order to start a conversation they have in mind. So I would usually give some answer: “I’m really enjoying baking bread right now, so I suppose flour.”

Then ask “what about you?” Which is usually when the really interesting and often much more off key conversation starts. If not, I can start talking about baking bread, so it’s win/win for me!