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:
If a fish lives in water that is very dark, the fish may calibrate its body over time to (A) absorb helium (B) turn invisible (C) eat more (D) be blind

Ex Output:
D


Ex Input:
A learned characteristic could be (A) Eye color (B) a cartwheel (C) freckles (D) Hair color

Ex Output:
B


Ex Input:
A man is trying to describe a single vat of juice he has. He needs the best way to tell his friend about the object, so he says (A) 20 meters of juice (B) 20 vats of juice (C) 20 ounces of juice (D) 20 feet of juice

Ex Output:

C