Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: Rod is the general shape of centrioles.

Answer: What is the general shape of centrioles?


Question: In the tropics tradewinds are the prevailing winds called.

Answer: In the tropics what are the prevailing winds called?


Question: Cancer is caused by mutations, which can be caused by pathogens, chemicals, or radiation.

Answer:
Cancer is caused by mutations, which can be caused by pathogens, chemicals, or what else?