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.

Ex Input:
Question: When it is very warm what happens to the speed of items?
Option1: speed up
Option2: slow down
Explanation: For a given medium, sound waves travel more slowly at lower temperatures.

Ex Output:
speed up

Ex Input:
Question: Rich was examining a cliff face. Which part of the cliff is younger, geologically speaking?
Option1: the base
Option2: the top
Explanation: The upper rock layers are much younger.

Ex Output:
the top

Ex Input:
Question: One side effect of driving cars is the production of greenhouse gases. If more cars are added to the roads, what would happen to the greenhouse effect on the Earth's atmosphere?
Option1: it would become greater
Option2: it would become smaller
Explanation: An increase in greenhouse gases leads to greater greenhouse effect.

Ex Output:
it would become greater