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:
Sound pulses helps dolphins (A) satisfy women (B) find God (C) find nourishment (D) find ibexes

Ex Output:
C


Ex Input:
In order for crops to grow food safely pesticides are used on them. When it floods, this can cause what to be poisonous? (A) Corn (B) air (C) Runoff (D) farmers

Ex Output:

C