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: Ian was applying heat to a reactant. The rate of the reaction that occurs will now be 
 Option1: faster 
 Option2: slower 
 Explanation: When the temperature of reactants is higher, the rate of the reaction is faster.
answer:
faster


question:
Question: Mike noticed that more people in his group were living longer, because the food they had was 
 Option1: better 
 Option2: worse 
 Explanation: With better food and less chance of disease, the death rate fell.
answer:

better