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: Kevin has a hybrid car and Steve has a large truck. Which car likely pollutes less? 
 Option1: hybrid 
 Option2: truck 
 Explanation: Plug-in hybrids run for a longer time on electricity and so are less polluting than regular hybrids.

SOLUTION: hybrid

PROBLEM: Question: Reed saw a cell through a microscope. He sees a cell has less visible mitochondria than the rest. This cell likely is _____ active compared to the others. 
 Option1: more 
 Option2: less 
 Explanation: Cells that are very active would typically have more mitochondria than cells that are less active.

SOLUTION: less

PROBLEM: Question: Going lower into the thermosphere will result in finding _____ temperatures. 
 Option1: higher 
 Option2: lower 
 Explanation: In the thermosphere, temperatures increase as altitude increases.

SOLUTION:
lower