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: Going higher in the mesosphere, we encounter _____ temperatures. 
 Option1: higher 
 Option2: lower 
 Explanation: In the mesosphere, temperature decreases as altitude increases.
answer:
lower


question:
Question: Milo has been cutting his nails out for a very long time. As his nails get shorter, what happens to the amount of cells added to them? 
 Option1: increase 
 Option2: decrease 
 Explanation: As the nail grows, more cells are added at the nail bed.
answer:
decrease


question:
Question: Will plays with an adjustable ramp for his cars. He sets the angle at 25 degrees and then at 15 degrees. Which ramp angle requires less input force on the cars? 
 Option1: 25 degrees 
 Option2: 15 degrees 
 Explanation: The more gradual the slope of the inclined plane, the less input force is needed and the greater the mechanical advantage.
answer:

15 degrees