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: Jeff removes energy from his water. The water becomes more 
 Option1: cold 
 Option2: hot 
 Explanation: The temperature of matter increases with the added energy.
answer:
cold


question:
Question: John was watching objects fall from the sky in the simulator. He observed that items with less mass will be pulled by gravity at a rate that is 
 Option1: Stronger 
 Option2: Weaker 
 Explanation: Gravity is a pull which all matter exerts on all other matter, the more mass, the stronger the pull.
answer:

Weaker