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

[EX Q]: Most hormones are produced by the endocrine system.
[EX A]: Most hormones are produced by which human organ system?

[EX Q]: You call elements that contain only atoms of one type of element native elements.
[EX A]: What do you call elements that contain only atoms of one type of element?

[EX Q]: Arginine amino acid do organisms incorporate into their proteins.
[EX A]:
Which amino acid do organisms incorporate into their proteins?