An answer (/ˈænsə(r)/) is a response to a question.
The answer to a closed question is limited. The answer to a yes/no question is yes, no or I don't know. The answer to an alternative question is included in the question itself. The answer to an information question is information.
In response to an interesting answer, you can ask a follow-up question.
A rhetorical question either lacks an answer, has an implied answer, or the speaker discusses the answer themself.
Answers to tests can be found in the answer key.