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

Ex Output:
B


Ex Input:
Which of these has resonating wood? (A) a lute (B) a bell (C) a metal flute (D) a saxophone

Ex Output:

A