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 hole over antarctica causes global warming. 
Question: What does a hole over Antarctica cause?
Example Output: Global warming.

Example Input: Fact: living things all require energy conservation as a trait. 
Question: living things all require energy conservation as a what?
Example Output: trait.

Example Input: Fact: Differentiation is the process by which neurons are created. 
Question: What is the process by which neurons are created?
Example Output:
differentiation.