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.

Input: Consider Input: Fact: Ozone depletion increases the risk of getting skin cancer. 
Question: What increases the risk of getting skin cancer?

Output: Ozone depletion.


Input: Consider Input: Fact: Chemical weathering causes FE in rock to oxidize. 
Question: Chemical weathering causes what in rock to oxidize?

Output: Fe.


Input: Consider Input: Fact: Vinegar changes the color of litmus paper from blue to red. 
Question: What would change the color of litmus paper from blue to red?


Output: vinegar.