instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
For to synthesize glycogen purpose does liver use the excess carbohydrate.
answer:
For what purpose does liver use the excess carbohydrate?


question:
A pregnant woman should avoid toxic substances while pregnant.
answer:
What should a pregnant woman avoid while pregnant?


question:
The nervous system plays a critical role in the regulation of vascular homeostasis.
answer:

What system plays a critical role in the regulation of vascular homeostasis?