In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").

Ex Input:
John Muir would likely set aside an area for (A) superheroes and villains (B) oaks and chipmunks (C) bankers and politicians (D) cars and boats

Ex Output:
B


Ex Input:
What is the source of cooling that turns lava into land? (A) seawater (B) refrigerators (C) air conditioning (D) glaciers

Ex Output:
A


Ex Input:
which one of these is false about the greenhouse effect? (A) it could cause polar melting (B) it causes green air in the sky (C) it causes overall temperature rise (D) it heats up the atmosphere

Ex Output:

B