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:
If something is in an ecosystem, it could be (A) invisible (B) vacuum of space (C) lacking life (D) alien

Ex Output:
C


Ex Input:
Which are in opposition for similar chow? (A) cats and mice (B) dogs and sycamores (C) bears and salmon (D) lions and hyenas

Ex Output:
D


Ex Input:
All living things are made of parts that contain a (A) blood vessel (B) heart (C) nucleus (D) skeleton

Ex Output:

C