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: mammals can generate heat by muscle action. 
Question: What can mammals generate heat with?

Ex Output:
Muscle action.


Ex Input:
Fact: High pressure systems cause calm weather conditions. 
Question: High pressure systems cause what weather conditions?

Ex Output:
calm.


Ex Input:
Fact: Sexual reproduction involves a sperm and egg fusing to form a diploid zygote. 
Question: What involves a sperm and egg fusing to form a diploid zygote?

Ex Output:

sexual reproduction.