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 cannot make their own food. 
Question: What cannot make their own food?
Example Output: animals.

Example Input: Fact: An organism requires energy for a healthy personality. 
Question: An organism requires what for a healthy personality?
Example Output: energy.

Example Input: Fact: a nest is used for protecting eggs by birds. 
Question: Which animals use nests to protect their eggs?
Example Output:
birds.