Instructions: 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.
Input: Question: John was watching the sound waves in his electronic monitor when he noticed something. The speed of the sound waves was slower when the temperature was 
 Option1: higher 
 Option2: lower 
 Explanation: For a given medium, sound waves travel more slowly at lower temperatures.
Output:
lower