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: Gases released during the use of oil causes global warming. 
Question: Gases released during the use of oil causes what?
[EX A]: global warming.

[EX Q]: Fact: a polar bear requires extremely low humidity. 
Question: what does a polar bear require?
[EX A]: extremely low humidity.

[EX Q]: Fact: a form of alcohol is used to produce electricity by burning. 
Question: a form of alcohol is used to produce electricity by what?
[EX A]:
burning.