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: Nails prevent injury by forming protective plates over distal ends. 
Question: Nails prevent injury by forming protective plates over what ends?

Output: distal.


Input: Consider Input: Fact: loud noises can cause animals to become dangerous. 
Question: What can cause animals to become dangerous?

Output: Loud noises.


Input: Consider Input: Fact: aging occurs as mitosis slows for good. 
Question: What happens as mitosis slows for good?


Output: aging.