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 object converts electrical energy into sound on a (A) iphone (B) soft carpet (C) outside wall (D) wooden table

Ex Output:
A


Ex Input:
What does a seismograph measure? (A) the motion produced by underground collisions (B) the quaking of a man in fear (C) how strong the earth quakes beneath a stampeding herd (D) how strong waves can break plates

Ex Output:
A


Ex Input:
Sunlight is a source of light from what? (A) lamps (B) lightbulbs (C) local star (D) star actor

Ex Output:

C