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

Example Input: Solids are categorized by the forces holding the individual atoms, ions, or molecules together.
Example Output: What is categorized by the forces holding the individual atoms, ions, or molecules together?

Example Input: Hemodialysis has a patient’s blood pass through a length of tubing that travels through an artificial kidney machine.
Example Output: Which form of dialysis has a patient’s blood pass through a length of tubing that travels through an artificial kidney machine?

Example Input: The behavior of ideal gases is explained by kinetic molecular theory.
Example Output:
The behavior of ideal gases is explained by what theory of gases?