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 student leaves a nail line on a mineral sample, so that mineral can be described as what? (A) a mineral (B) a soft mineral (C) a liquid mineral (D) a mineral melt

Ex Output:
B


Ex Input:
Which of the following is never an element used to make carbohydrates for the plant? (A) sand (B) water (C) sunlight (D) carbon dioxide

Ex Output:
A


Ex Input:
A learned behavior (A) newborn turtles crawling towards the sea (B) seals clapping to the delight of an audience (C) ducks sitting on their eggs (D) baby birds chewing worms (D) mother dogs nursing their pups

Ex Output:

B