Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.
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Question: Fact: if an object is hot then the surfaces of that object are hot

Answer: Which of these is likely to get hot?


Question: Fact: rain is a source of water

Answer: Rain helps?


Question: Fact: processes sometimes produce waste products

Answer:
What product eventually will become human waste?