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

[EX Q]: muscles contracting cause a person's arm to straighten
[EX A]: What causes a person's arm to straighten?

[EX Q]: A camera is used for recording still and moving pictures.
[EX A]: What is used for recording still and moving pictures?

[EX Q]: Triathlons require a lot of calories
[EX A]:
What type of sport requires a lot of calories?