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:
the mantle is (A) a level of our planet (B) the planet closest to ours (C) a kind of rock found on Earth (D) the deepest part of our planet

Ex Output:
A


Ex Input:
Which doesn't contain water? (A) Sea of Tranquilitiy (B) Caspian Sea (C) Dead Sea (D) Caribbean Sea

Ex Output:
A


Ex Input:
How many times does an equinox occur in the first half of the year (A) three times (B) once (C) twice (D) four times

Ex Output:

B