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.

[EX Q]: Question: Endotherms have the ability to regulate their own temperature. By decreasing it's rate of metabolism, the body heat becomes 
 Option1: Decreased 
 Option2: Increased 
 Explanation: For example, on a cold day, an endotherm may produce more body heat by increasing its rate of metabolism.
[EX A]: Decreased

[EX Q]: 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.
[EX A]: the substance with the lower pH

[EX Q]: Question: Going higher into the thermosphere will result in finding _____ temperatures. 
 Option1: higher 
 Option2: lower 
 Explanation: In the thermosphere, temperatures increase as altitude increases.
[EX A]:
higher