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:
the presence of which of these is required for the formation of cavernous chambers? (A) some carbonated soda (B) some carbon dioxide (C) some carbonic acid (D) carbon monoxide gas

Ex Output:
C


Ex Input:
Which would an alligator eat (A) spider (B) crab (C) squid (D) tilapia

Ex Output:
D


Ex Input:
Which likely causes the most waste? (A) a twinkie factory (B) sustainable fisheries (C) solar panels (D) a wind farm

Ex Output:

A