Hot or cold

I'm offered breakfast.

"Hot or cold?" I'm asked.

"What's the difference? " I reply.

"One's hot and one's cold."

I knew that.  What made her think I couldn't figure out that one of the differences was temperature?

One, it transpires is a full English breakfast and one has fruit and yoghurt. I could have assumed a multitude of variations which is why I asked the question.

I chose cold.