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").

Input: Consider Input: If something is in an ecosystem, it could be (A) invisible (B) vacuum of space (C) lacking life (D) alien

Output: C


Input: Consider Input: Which animal eats prey? (A) beetle (B) horse (C) rabbit (D) buffalo

Output: A


Input: Consider Input: Which of the following is true? (A) gut flora can make you more healthy (B) bacteria is always bad (C) bacteria in your brain helps digest food (D) gut bacteria always makes you sick


Output: A