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.

Example Input: Question: The blood vessels near the top of the skin do what when it's cool? 
 Option1: enlarge 
 Option2: contract 
 Explanation: When your brain senses that your body temperature is increasing, it sends messages to the blood vessels in the skin to increase in diameter.
Example Output: contract

Example Input: 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.
Example Output: the substance with the lower pH

Example Input: Question: Tina is putting on a sweater. As she stops stretching out the material, its elastic force 
 Option1: increases 
 Option2: decreases 
 Explanation: The farther the material is stretched or compressed, the greater the elastic force becomes.
Example Output:
decreases