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: incinerated mercury can cause the ph of soil to decrease. 
Question: what can cause the ph of soil to decrease?
Example Output: incinerated mercury.

Example Input: Fact: Passenger pigeons could not produce enough offspring. 
Question: What could not produce enough offspring?
Example Output: passenger pigeons.

Example Input: Fact: Diversity is a good thing in sexual reproduction. 
Question: What is a considered a good thing coming from sexual reproduction?
Example Output:
Diversity.