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: which form of transportation has zero emissions? (A) motorbikes (B) speed boats (C) hybrid cars (D) pedal bikes
Example Output: D

Example Input: Despite what some think, instead  around themselves, our planet spins around (A) pluto (B) the moon (C) the milky way (D) the sun
Example Output: D

Example Input: Fluid from clouds tends to increase (A) animal hydration (B) animal perspiration (C) plant thirst (D) animal thirst
Example Output:
A