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: David is getting ready to fly into space on a rocket. As the rocket shoots upwards, part of the mass attaches, allowing the rocket to go
Option1: higher
Option2: lower
Explanation: By using multiple stages, empty fuel containers could drop away. This reduced the mass of the rocket so that it could fly higher.
answer:
lower

question:
Question: Devon's cat, Fluffy, is looking for a nice warm spot to lay out in the sun. Because of how the sun heats the earth, and how some heat radiates into the air, the cat laying on the ground, rather than high up in a tree branch, would keep the cat
Option1: cooler
Option2: warmer
Explanation: The surface is heated by the Sun and some of that heat radiates back into the air. This makes the temperature higher near the surface than at higher altitudes.
answer:
warmer

question:
Question: John was a doctor in a cancer ward and knew that early detection was key. The cancer being detected slowly makes the cancer treatment
Option1: Easier
Option2: Harder
Explanation: The sooner cancer is detected the easier it is to treat.
answer:
Harder