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 is a source of oxygen through photosynthesis? (A) lakes (B) car engines (C) sunflowers (D) people

Ex Output:
C


Ex Input:
Every 1440 minutes (A) the moon is full (B) there's a lunar eclipse (C) a new year starts (D) the sun sets in the west

Ex Output:
D


Ex Input:
if a person rips up their notebook, what happens? (A) all the mentioned options (B) the shape becomes different (C) it takes a new structure (D) it loses its original form

Ex Output:

A