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:
speed is a measure of how fast all these move but (A) a person waiting (B) a fish swimming (C) a dog running (D) a bird flying

Ex Output:
A


Ex Input:
A wolf would eat (A) an ibex (B) a mountain (C) a tree (D) a cloud

Ex Output:
A


Ex Input:
Which of these is less likely to cause pollution (A) mountain bike (B) motor bike (C) dirt bike (D) chopper

Ex Output:

A