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: Exposure to cold can induce many muscle fibers to contract at once. 
Question: Many muscle fibers contracting at once can be induced by?
Example Output: exposure to cold.

Example Input: Fact: food can cause illness. 
Question: What is a source of  illness?
Example Output: food.

Example Input: Fact: all chordates have evolved jaws. 
Question: all chordates have what?
Example Output:
evolved jaws.