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").

Ex Input:
Which of the following would have best aided a vessel at sea in crossing the sea in the 18th century? (A) A radar system (B) An old soothsayer (C) An experienced navigator (D) A crow's nest

Ex Output:
C


Ex 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

Ex Output:
B


Ex Input:
A rose bush photosynthesizes and nearby people (A) are stung by bees (B) visit a foreign country (C) get new fresh air (D) drink more iced tea

Ex Output:

C