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

Hookworms infest the intestines.
What part of the body do hookworms infest?

The female reproductive system consists of structures that produce eggs, secrete female sex hormones, and ultimately enable birth of a fetus.
What system consists of structures that produce eggs, secrete female sex hormones, and ultimately enable birth of a fetus?

The the core is the innermost layer of the sun.
What is the innermost layer of the sun called?