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: Aging is associated with apoptosis. 
Question: What stage is associated with apoptosis?
Example Output: aging.

Example Input: Fact: melting means changing from a solid into a liquid by increasing temperature. 
Question: what is increased to cause something to change from a solid into a liquid?
Example Output: temperature.

Example Input: Fact: Water that completely fills a container will need more space than the conatiner has when it freezes. 
Question: What will frozen water take up more of in a container?
Example Output:
Space.