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:
An echo is produced by what type of reflection of sound source? (A) Direct (B) Distant (C) Varied (D) Single

Ex Output:
D


Ex Input:
A metal rod is sitting outside and soaks up a lot of energy from a star, so the metal (A) cries (B) wiggles (C) sears (D) dies

Ex Output:
C


Ex Input:
Wildfire is when what catches fire? (A) timberland (B) farms (C) cities (D) winds

Ex Output:

A