Given a statement, generate a question such that the answer is contained in that statement.
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Question: Streptococcus can be spread directly from one person to another.

Answer: What can be spread directly from one person to another?

Question: bone density decreases when osteoclasts are more active than osteoblasts

Answer: What is more active than osteoblasts?

Question: working out requires a lot of fuel.

Answer:
What does working out require?