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?

Carbon 14 isotope of carbon is typically used to date ancient items.
What isotope of carbon is typically used to date ancient items?

Molar masses can be used to determine the mass of a quantity of material.
What can be used to determine the mass of a quantity of material?