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

Ex Input:
Muscles in the upper arm lengthen a person's elbow.

Ex Output:
What lengthen a person's elbow?


Ex Input:
optical instruments help explain the natural world

Ex Output:
What help explain the natural world?


Ex Input:
humans took advantage of the extinction of dinosaurs

Ex Output:

What species did humans take advantage of?