TASK DEFINITION: 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.
PROBLEM: Question: When we get lower in the air what happens to the temperature? 
 Option1: goes up 
 Option2: goes down 
 Explanation: In the mesosphere, temperature decreases as altitude increases.

SOLUTION: goes up

PROBLEM: Question: Dwayne Johnson is much stronger than Kevin Hart because he exercises more and therefore his muscles have grown 
 Option1: larger or 
 Option2: smaller. 
 Explanation: Exercising muscles increases their size, and bigger muscles have greater strength.

SOLUTION: larger or

PROBLEM: Question: A rocket should be able to fly higher if its mass were 
 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.

SOLUTION:
lower