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:
A star produces light energy and heat because it has a variety of (A) moon rotation causing friction (B) light energy flowing to earth (C) reactions of nuclear form (D) global warming caused by co2

Ex Output:
C

Ex Input:
The moon reflects rays of sun from our (A) red giant (B) jupiter (C) yellow dwarf (D) whit dwarf

Ex Output:
C

Ex Input:
Which animal will eat only plants? (A) snake (B) fish (C) slug (D) deer

Ex Output:
D