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: 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: Power outages can cause a light bulb to go off. 
Question: What do power outages do to light bulbs?
Example Output: turn them off.

Example Input: Fact: FM systems are used for sound communication. 
Question: What is used to communicate?
Example Output:
FM systems.