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.

Ex Input:
Fact: force causes the speed of a crystal ball to increase. 
Question: What can force affect the speed of?

Ex Output:
a crystal ball.


Ex Input:
Fact: The enclosure of the lower part of the flower is usually green. 
Question: The enclosure of the lower part of the flower is what?

Ex Output:
usually green.


Ex Input:
Fact: some viruses have an envelope of body fats and proteins. 
Question: besides proteins, what do some viruses have an envelope of?

Ex Output:

body fats.