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: Cellular respiration releases (A) blood (B) waste (C) snot (D) feces
Example Output: B

Example Input: which of these people would be most susceptible to disease? (A) a person with a healthy white blood cell (B) a person with optimal conditions (C) a person with a weak white blood cell (D) an athlete with a clean bill of health
Example Output: C

Example Input: if a student needed to warm up, which of these would help? (A) all of these (B) sitting by the fireplace (C) sitting next to a running engine (D) turning up the room heater
Example Output:
A