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

[EX Q]: The cells in the follicle undergo physical changes and produce a structure called a corpus luteum.
[EX A]: The cells in the follicle undergo physical changes and produce a structure called a what?

[EX Q]: Water contains 3 atoms.
[EX A]: How many atoms does water contain?

[EX Q]: Photosynthetic process is magnesium important to.
[EX A]:
What process is magnesium important to?