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 volume of an object can be used to measure the mass of the object. 
Question: The volume of an object can be used to measure what?
Example Output: the mass of the object.

Example Input: Fact: male dogs use natural aphrodisiacs in urine to mark their territory. 
Question: what do male dogs use in their urine to mark their territory?
Example Output: natural aphrodisiacs.

Example Input: Fact: Arteries generally carry bright red fluid. 
Question: Arteries generally carry bright red what?
Example Output:
fluid.