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

Ex Input:
cooling things can be pricey

Ex Output:
What can cooling things be?


Ex Input:
working out requires a lot of fuel.

Ex Output:
What does working out require?


Ex Input:
therian mammals give birth to live young, and house the embryo until it is complete

Ex Output:

Who give birth to live young?