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: A boy is waiting to see a full moon. He notes that the full moon is tonight, and looks at it. If he wants to see another, he must wait (A) a week (B) a day (C) a fortnight (D) a month
Example Output: D

Example Input: Glasses help you (A) fry ants (B) pay for crimes (C) remedy eyesight issues (D) observe Uranus
Example Output: C

Example Input: Catfish are what (A) cannibals (B) fairies (C) grapes (D) unicorns
Example Output:
A