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: Dilation occurs when cell walls ease up. 
Question: What occurs when cell walls ease up?
Example Output: dilation.

Example Input: Fact: x-rays are used in oncology. 
Question: what are used in oncology?
Example Output: x-rays.

Example Input: Fact: an energy source used by devices moves well through wires and water. 
Question: an energy source used by devices moves well through what?
Example Output:
wires and water.