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: Food is used for energy by the cells of most organisms. 
Question: Food is used for energy by what part of most organisms?

Output: Cells.


Input: Consider Input: Fact: Beavers cause ponds and lakes to form. 
Question: What can be the cause of lakes and ponds forming?

Output: beavers.


Input: Consider Input: Fact: A thick pelt can be used for keeping warm. 
Question: What can be used by an animal to keep warm?


Output: a thick pelt.