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

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

Example Input: Plant nutrition is the study of the chemical elements necessary for plant growth.
Example Output: What is the study of the chemical elements necessary for plant growth called?

Example Input: The cranium (skull) protect(s) the brain.
Example Output:
What part of the body protects the brain?