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

[EX Q]: Glycerol is a triol, an alcohol which contains three hydroxl functional groups.
[EX A]: Glycerol is a triol, an alcohol which contains three what?

[EX Q]: Ice masses, acquifers, and the deep ocean are examples of water reservoirs.
[EX A]: Ice masses, acquifers, and the deep ocean are examples of water what?

[EX Q]: Evaporation is responsible for changing liquid water into water vapor.
[EX A]:
Which of the following processes is responsible for changing liquid water into water vapor?