specilized or...?

I have the following dialogue to examplify the issue:

Jimmy : Hi, Henry. I'm reading some corporate news in today's newspaper. Now can you tell me what a blance sheet is.

Henry : Ur. This question is very specilized. Balance sheet is a term used in accountancy.

Here comes my inquiry. The italicized sentence is made up by word for word translation from Chinese to English. I know it's realy awkward or even disgusting, but Chinese peopoe speak of it so often. I wonder how native english speakers put it when they want to tell someone that his question calls for specilized knowledge or expertise or a professional to answere.

Any comment is highly appreciated.