In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.

Q: What's the name for earth's supply of water?

A: hydrosphere
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Q: Who is playing black panther in the new movie?

A: Chadwick Aaron Boseman
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Q: Who is the clarinet in peter and the wolf?

A:
cat
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