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: Passenger pigeons could not produce enough offspring. 
Question: What could not produce enough offspring?
Example Output: passenger pigeons.

Example Input: Fact: Bulbs require electrical energy to see in darkness. 
Question: Bulbs produce electrical energy to what?
Example Output: see in darkness.

Example Input: Fact: Air pollution damages the heart. 
Question: What organ is harmed by air pollution?
Example Output:
heart.