An answer key is a key to the answers (to a test or exercise). It's usually a copy of the test or exercise with the instructor's idea of the best possible answers written in.
Answer key vs key answer? - English Language & Usage Stack Exchange
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If you have one key, then it should be answer key. However, when you have a set of keys, and you are referring to the set, rather than individual keys, you should refer to answer-keys. You need to differentiate between references to the set, and references to individual members of a set. For some situations, you need to refer to the whole set.
"Answer Key" or "Answer Keys"? - English Language & Usage Stack Exchange
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The Indian Express: KEA releases KCET 2026 provisional answer keys; raise objections till April 30
KEA releases KCET 2026 provisional answer keys; raise objections till April 30
Zee News on MSN: KCET answer key 2026 out at cetonline.karnataka.gov.in, Objection window open till April 30
KCET answer key 2026: The Karnataka Examinations Authority (KEA) has announced KCET answer key for the candidates. The answer key released is provisional in nature.
KCET answer key 2026 out at cetonline.karnataka.gov.in, Objection window open till April 30
The Times of India on MSN: KCET 2026 answer key released at cetonline.karnataka.gov.in: Check direct link, steps to raise objections here