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: animals use sound to find a mate. 
Question: What do animals use to find a mate?
Example Output: sound.

Example Input: Fact: sickness has a negative impact on an organism. 
Question: What has a negative impact on an organism?
Example Output: sickness.

Example Input: Fact: a cactus stem is used for storing h2o. 
Question: what is a cactus stem used for storing?
Example Output:
h2o.