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:
What will air usually do when heated up beyond a certain point? (A) it will fall (B) it will remain (C) it will ascend (D) it will die

Ex Output:
C


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 is a source of raw materials? (A) a power plant (B) a factory (C) a shopping mall (D) an oil field

Ex Output:

D