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: hairy animals nourish young with milk. 
Question: How to mammals nourish young?
Example Output: milk.

Example Input: Fact: erosion forms canyons. 
Question: What are formed by erosion?
Example Output: canyons.

Example Input: Fact: radiography is used to study viruses. 
Question: What is used to study viruses?
Example Output:
radiography.