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: The basic outside of our planet is comprised of (A) types of stone (B) frozen green grass (C) solid ice balls (D) molten hot lava
Example Output: A

Example Input: A vehicle stops when brakes are pressed because (A) the tires are being halted by pressure (B) the streets are bumpy (C) the roads have friction (D) the tires are unable to create friction
Example Output: A

Example Input: Pollination is required for what reproduction? (A) elephant (B) bug (C) bird (D) flora
Example Output:
D