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: rain can break down rocks into smaller pieces. 
Question: What can rain do to rocks?
Example Output: Break down.

Example Input: Fact: protective plates over the ends of the fingers become more brittle with age. 
Question: What do fingers have over the ends that become more brittle with age?
Example Output: protective plates.

Example Input: Fact: A flashlight requires batteries to produce light. 
Question: A flashlight requires what to produce light?
Example Output:
batteries.