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: Which can be used to pass information from one person to another? (A) an invention by Marconi (B) an invention by Newton (C) an invention by McCormick (D) an invention by Pasteur
Example Output: A

Example Input: Volcanoes, have a (A) Esophagus (B) Camels (C) Emotional experience (D) Cigarettes
Example Output: A

Example Input: if a person gets some fruit wine for a gift, how can they measure its volume? (A) they can use a cylinder with unit markings (B) none of these (C) they can use a tape measure (D) they can use a thermometer
Example Output:
A