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:
What did some ancient societies use to reflect light? (A) wood (B) plants (C) clothing (D) rocks

Ex Output:
D


Ex Input:
If a wolf wants to grow big and strong, what must he have? (A) a car to drive (B) a house to live in (C) a bus to sell (D) good eyes to see with

Ex Output:
D


Ex Input:
Humans cry when they are born, horses can walk when they are born, and birds can chirp when born because of (A) TV (B) learning from mom (C) instinctive behavior (D) school

Ex Output:

C