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: A chemist compared two substances in the lab. Which substance will have a higher concentration of hydrogen ions? 
 Option1: the substance with the higher pH 
 Option2: the substance with the lower pH 
 Explanation: The lower the pH value is, the greater is the concentration of hydrogen ions and the stronger the acid.
answer:
the substance with the lower pH


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: Jan and Brad were able to feed themselves only spending ten dollars a day total. After they lost their child, they had to spend five dollars a day total, because their familial population had 
 Option1: shrank 
 Option2: grown 
 Explanation: More people need more resources.
answer:

shrank