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

[EX Q]: All life is built around the element carbon.
[EX A]: What element is all life built around?

[EX Q]: Southern asia does the most important monsoon in the world occur.
[EX A]: Where does the most important monsoon in the world occur?

[EX Q]: In a hydrogen replacement reaction, the hydrogen in the acid is replaced by an active metal.
[EX A]:
In a hydrogen replacement reaction, the hydrogen in the acid is replaced by what?