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

Ex Input:
ferns are producers

Ex Output:
Who are producers of what species?


Ex Input:
The outermost whorl of changed leaves are usually green

Ex Output:
What is the color of the outermost leaf?


Ex Input:
Tadpoles become frogs after four months.

Ex Output:

How long ago do tadpoles become frogs?