instruction:
You are given a question or fill-in-the-blank question, two answer options (Option1 and Option2) and an Explanation. Your task is to find the correct answer (return the string of the correct option, not option1/2) for the given question from the given options and using explanation.
question:
Question: What will happen to the levels of pollution on Earth if the population increases? 
 Option1: they will rise 
 Option2: they will fall 
 Explanation: For example, more people on the Earth means more people contributing to global warming and pollution.
answer:
they will rise


question:
Question: Farmer Bill got an older machine to sift his wheat. This machine causes him to grow _____ food. 
 Option1: more 
 Option2: less 
 Explanation: More advanced farming practices allowed a single farmer to grow food for many more people.
answer:
less


question:
Question: If Milo starts rubbing two surfaces together slowly and then increases the speed, what happens to the amount of energy produced? 
 Option1: increases 
 Option2: decreases 
 Explanation: Friction causes the molecules on rubbing surfaces to move faster, so they have more energy. This gives them a higher temperature, and they feel warmer.
answer:

increases