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: large animals that roamed the planet were replaced with mammals after their extinction

Output: What were large animals replaced with after their extinction?


Input: Consider Input: Weather refers to the conditions of a layer of gases around a planet


Output: What refers to the conditions of a layer of gases around a planet?