A direct loanword from English, used in contexts like quizzes, interviews, or formal replies. Often interchangeable with 答え (こたえ) but carries a slightly more modern or technical feel.
Please tell me the answer to the quiz.
I haven't received an answer from him yet.
answering machine; answerphone
answer mode
multiple-answer format; check-all-that-apply
answer file
Borrowed from English 'answer'.