Write a correct answer to the given question based on its associated fact. Make sure that your answer is contained in the associated fact. Don't be creative and introduce any new word that is not mentioned in the associated fact! Remember that the associated fact has been rearranged to form the question. So, the correct answer words must lie within the associated fact. The correct answer can be a word, phrase, or even a sentence.

[EX Q]: Fact: Hot vapor makes the haze denser. 
Question: When does haze get denser?
[EX A]: When the water is hot.

[EX Q]: Fact: muscles contain cells. 
Question: What do muscles contain?
[EX A]: cells.

[EX Q]: Fact: evaporation can be used for separating salt from water. 
Question: What could be used to separate salt from water?
[EX A]:
Evaporation.