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.

Input: Consider Input: Fact: mammals keep warm with hair. 
Question: what do mammals keep warm with?

Output: hair.


Input: Consider Input: Fact: a drug that can be addictive is an example of a psychoactive drug. 
Question: a drug that can be addictive is an example of a what?

Output: psychoactive drug.


Input: Consider Input: Fact: a surface not sterilized is likely to be covered with something that eats and digests foods. 
Question: a surface that is not what is likely to be covered with something that eats and digests foods?


Output: sterilized.