I'm looking for an unambiguous word (or expression) for referring to a question and a corresponding answer as a single entity.
The word should express that no more and no less than 1 question and 1 answer is covered, and that they correspond to each other.
The terms "request, response" may be technical jargon but I'm looking for a general word (it may be technical or not).
(In case this should be obvious, please merge this to ELL, I'm not native.)