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: chromosome duplication occurs when cell division produces gametes. 
Question: chromosome duplication occurs when cell division does what?

Ex Output:
produces gametes.


Ex Input:
Fact: Deep gorges are formed by flowing rivers through erosion over long periods of time. 
Question: What are formed by flowing rivers through erosion over long periods of time?

Ex Output:
deep gorges.


Ex Input:
Fact: Smog can penetrate deep into lungs. 
Question: What undesireable item can iritate when it penetrates lungs?

Ex Output:

Smog.