Given a statement, generate a question such that the answer is contained in that statement.
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Question: paleontologists study dinosaur skeletons

Answer: What do paleontologists study?


Question: mosquitos are naturalized on every continent except the coldest

Answer: What are naturalized on every continent except the coldest?


Question: Blocked tubes can cause inability to have children and issues with reproduction.

Answer:
What can cause inability to have children and issues with reproduction?