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: Viruses are viewed by illuminating electrons. 
Question: What of the following can only be viewed by illuminating electrons?
Example Output: viruses.

Example Input: Fact: Genes are molecules that contain a single protein. 
Question: what are molecules that contain a single protein?
Example Output: genes.

Example Input: Fact: Warm air moving into cold air causes cloudy and rainy weather. 
Question: What causes cloudy and rainy weather?
Example Output:
Warm air moving into cold air.