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

Input: Consider Input: Carried through body happens if cancer cells enter the blood stream.

Output: What happens if cancer cells enter the blood stream?

Input: Consider Input: Moving air masses is the main reason for weather change.

Output: What is the main reason for weather change?

Input: Consider Input: An endocrine disease usually involves the secretion of too much or not enough hormone by endocrine gland.
Output: An endocrine disease usually involves the secretion of too much or not enough hormone by which gland?