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: If you had a hammer, you would find ____ nails made of ____ (A) wood; wood (B) iron; wood (C) wood; iron (D) iron; iron
Example Output: D

Example Input: A tree must depend upon, for its support (A) A large fibrous mass (B) plants on the forest floor (C) the wooden welfare state (D) massive redwoods on the backs of turtles
Example Output: A

Example Input: Hunting any kind of animal will eventually cause that species population numbers to (A) go down (B) phone number (C) atomic number (D) egg shell number
Example Output:
A