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

[Q]: Stimuli can cause the brain to experience pain.
[A]: Stimuli can cause the brain to experience what?

[Q]: eagles use pectorals to move their wings
[A]: What do eagles use to move wings?

[Q]: Muscles contracting makes a person's elbow straighten.
[A]:
What kind of straightens a person's body?