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").

Example Input: Digestion is when stomach acid breaks down what? (A) food essays (B) sustenance (C) water (D) air
Example Output: B

Example Input: When the amount of food goes down, the amount of conflict between the organisms searching for it will (A) nothing. (B) remain the same (C) go down (D) go up
Example Output: D

Example 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
Example Output:
B