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.

Example Input: Fact: roundworms may be free-living or live off a host. 
Question: aside from free-living, where else can roundworms exist?
Example Output: live off a host.

Example Input: Fact: All cnidarians live in water. 
Question: All cnidarians live in?
Example Output: water.

Example Input: Fact: metal becomes orange on the surface as a  result of oxidation. 
Question: metal becomes orange on the surface as a result of?
Example Output:
oxidation.