Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.

[Q]: Fact: a skunk produces a bad odor
[A]: A skunk produces a bad what?


[Q]: Fact: the moon does not contain water
[A]: Which doesn't contain water?


[Q]: Fact: an oven is a source of heat
[A]:
The ability that an oven has to turn ingredients into a moist cake come from its?