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?


[Q]: As a myotube is formed from many different myoblast cells, it contains many nuclei, but has a continuous cytoplasm.
[A]: As a myotube is formed from many different myoblast cells, it contains many nuclei, but has a continuous what?


[Q]: The urinary system system controls the amount of water in the body and removes wastes.
[A]:
Which human body system controls the amount of water in the body and removes wastes?