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

Ex Input:
A fish's skin allow fish to move through the water without slowing down too much

Ex Output:
What allows fish to move through the water without slowing down too much?


Ex Input:
Binoculars are optical tools.

Ex Output:
What are optical tools?


Ex Input:
Tadpoles undergo transformation.

Ex Output:

Who undergoes transformation?