Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[EX Q]: Producing sperm and secreting testosterone are the main functions of male reproductive system system.
[EX A]: Producing sperm and secreting testosterone are the main functions of what system?

[EX Q]: The term elastic potential energy is used to describe potential energy due to an object's shape.
[EX A]: What term is used to describe potential energy due to an object's shape?

[EX Q]: In the tropics tradewinds are the prevailing winds called.
[EX A]:
In the tropics what are the prevailing winds called?