are some common ways you could say this. However, you can also return the question; as in English, this especially depends on how long the first answer is. As an example, in:
> A
>
> B **A**
reiterating the question could come off as a bit awkward (but then again, sometimes you hear people do that). However, if B went on and on about how his childhood days were boring because he was the only child, and then decided to ask A, it would make sense to go with something like:
> B……
>
> A……
>
> B: … **A**
Also, you can use A if you want to give the nuance that A's answer is more relevant in one way or another. Kind of like in "Forget about me; what about you?". E.g. (with an informal tone):
> A:B
>
> B…… **A** ……
>
> A:…
etc.