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: Would a star that is significantly cooler than the sun, which is outputting blue light which is higher in frequency that the yellow light of the Sun, be 
 Option1: hotter 
 Option2: colder? 
 Explanation: Shorter wavelengths (higher frequencies) correspond to higher energies and thus hotter star temperatures.

SOLUTION: colder?

PROBLEM: Question: Jerry weighs 200 pounds. Polly weighs 120 pounds. Who has more inertia? 
 Option1: Jerry 
 Option2: Polly 
 Explanation: Objects with greater mass have greater inertia.

SOLUTION: Jerry

PROBLEM: Question: Would a diesel powered submarine release more pollution if it were running on 
 Option1: its diesel engine 
 Option2: its battery backup power? 
 Explanation: Plug-in hybrids run for a longer time on electricity and so are less polluting than regular hybrids.

SOLUTION:
its diesel engine