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:
Volcanoes, have a (A) Esophagus (B) Camels (C) Emotional experience (D) Cigarettes

Ex Output:
A


Ex Input:
A light using energy can cease that activity when (A) light bulbs are gold (B) lights are always on (C) wall switch is adjusted (D) walls are painted blue

Ex Output:
C


Ex Input:
What United States unit of measurement would be most comparable to a meter stick (A) Mile Marker (B) ruler (C) Tape Measurer (D) Yardstick

Ex Output:

D