And do you know the answer I came up with?

I don't know the answer to the question which one works best.

He already knew the answer to the question, of course.

With almost any other person she would have known the answer.

But I knew the answer to the last well enough.

I do not know the answer to the second question.

And then, before the words were even out of her, she knew the answer.

If you do not know the answer to a question, say so.

No I don't really know the answer to the question.

I only know the answer as one word, with the second part in front of the first.