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

Example Input: Cats can hunt at night
Example Output: When can Cats hunt?

Example Input: A sifter can be used for separating flours.
Example Output: What can a sifter be used for?

Example Input: a thinning and weakening of bone is an affliction in which osteoclasts are more active than osteoblasts
Example Output:
What are more active than osteoblasts?