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

[EX Q]: Multiple genes mutations is usually necessary to develop cancer.
[EX A]: What is usually necessary to develop cancer?

[EX Q]: A human cannot survive the loss of the liver of the following.
[EX A]: A human CANNOT survive the loss of which of the following?

[EX Q]: Three many pathways do plants have for carbon fixation.
[EX A]:
How many pathways do plants have for carbon fixation?