Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Q: A pregnant woman should avoid toxic substances while pregnant.

A: What should a pregnant woman avoid while pregnant?
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Q: The mesopause is at the top of the mesosphere.

A: What is at the top of the mesosphere?
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Q: The volume of a regularly shaped solid can be calculated from its dimensions.

A:
The volume of a regularly shaped solid can be calculated from its what?
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