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: What is the source of cooling that turns lava into land? (A) seawater (B) refrigerators (C) air conditioning (D) glaciers
Example Output: A

Example Input: What substance found in rocks shares it's name with an object which can take wrinkles from an item worn on the body to cover the skin from the elements? (A) Iron (B) Stove (C) Copper (D) Steamer
Example Output: A

Example Input: A simple machine like a screw will need (A) a glass of cool water (B) a person adjusting it (C) a truck to move it (D) a wind turbine to function
Example Output:
B