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:
do all insects have to undergo every stage of change before becoming full grown? (A) all of these (B) insects are born live (C) pupa stage is sometimes skipped (D) pupa is a required stage

Ex Output:
C


Ex Input:
Lava on the ocean floor may build up upon itself. This is where (A) birds may be thinking (B) lone land mass develops (C) musical notes are heard (D) fish are buried in sand

Ex Output:

B