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:
Why animal may use a rock as shelter (A) Centipede (B) Dolphin (C) Seagull (D) Dog

Ex Output:
A


Ex Input:
Which event includes melting? (A) making ice (B) cooking in butter (C) cutting carrots (D) buttering bread

Ex Output:
B


Ex Input:
In the 60's people watched on TV while for the first time people walked on (A) a high rooftop in a major city (B) a satellite without much air in our solar system (C) the edge of a cliff in the mountains (D) a beach in Brazil

Ex Output:

B