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 is a byproduct of a lightbulb? (A) taste (B) death (C) warmth (D) sound
Example Output: C

Example Input: Who is most likely to die of old age? (A) adults (B) children (C) infants (D) reasonable high-school students
Example Output: A

Example Input: A tongue can adhere to metal if what occurs? (A) condensation (B) self-stimulation (C) evaporation (D) conduction
Example Output:
D