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

[EX Q]: Bile acids, needed to emulsify lipids, are stored in the body in the gallbladder.
[EX A]: Where are bile acids, needed to emulsify lipids, stored in the body?

[EX Q]: Cells have four cycles.
[EX A]: How many cycles do cells have?

[EX Q]: A role of mushrooms in ecosystems is breaking down dead plant material.
[EX A]:
Which of the following best describes a role of mushrooms in ecosystems?