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: a drum has a vibrating movement. 
Question: what has vibrating movement?
Example Output: drum.

Example Input: Fact: Digestion is the process of breaking down food proteins into energy or heat. 
Question: What is the process of breaking down food proteins into energy or heat?
Example Output: digestion.

Example Input: Fact: Sand dollars lack a centralized nervous system. 
Question: What lacks a centralized nervous system?
Example Output:
Sand dollars.