Given a statement, generate a question such that the answer is contained in that statement.

Input: Consider Input: The release of an egg during ovulation is used in mating.

Output: The release of an egg during ovulation is used in what?


Input: Consider Input: Muscles in the upper arm lengthen a person's elbow.

Output: What lengthen a person's elbow?


Input: Consider Input: cephalopods use ink for hiding from sharks


Output: What is used by cephalopods to hide from sharks?