I usually use “Sorry for the stupid question, but X is [answer I think most likely], isn’t it?”. I will learn the same thing as if I asked “What is X?”, but I won’t sound like an idiot.
I usually use “Sorry for the stupid question, but X is [answer I think most likely], isn’t it?”. I will learn the same thing as if I asked “What is X?”, but I won’t sound like an idiot.