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: Heat falls from the equator to the poles. 
Question: What falls decreasingly on the earth from the equator to the poles?

Ex Output:
heat.


Ex Input:
Fact: Mineral graphite can pierce the skin surface. 
Question: What can pierce the skin surface?

Ex Output:
Mineral graphite.


Ex Input:
Fact: erosion causes weathering over long periods of time. 
Question: what causes weathering over long periods of time?

Ex Output:

erosion.