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

Example Input: The outermost whorl of changed leaves are usually green
Example Output: What is the color of the outermost leaf?

Example Input: The volume of a thing depends on the mass of the object.
Example Output: What depends on the volume of a thing?

Example Input: at least two mirrors are used for observing stars by astronomers
Example Output:
How many mirrors are used for observing stars by astronomers?