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: The continents drifting causes earthquakes. 
Question: What causes earthquakes?
Example Output: Continents drifting.

Example Input: Fact: phones require electrical energy to function. 
Question: What do phones require to function?
Example Output: electrical energy.

Example Input: Fact: a bulb requires electrical energy to produce rays. 
Question: A bulb uses electrical energy to produce:?
Example Output:
rays.