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 topography of our only natural satellite's surface is (A) smooth (B) made of cheese (C) full of gold (D) mountainous
Example Output: D

Example Input: Unlike trees in the forest or a pond full of fish, metal is only available until (A) it is depleted for good (B) it is found on catfish scales (C) it becomes necessary to conduct electricity long distances (D) it is used to make diamond rings
Example Output: A

Example Input: What raw material is consumed by chloroplast (A) flour (B) stone (C) CO2 (D) lava
Example Output:
C