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 a chemical reaction occurs, it might have been triggered by which of these? (A) a person yelling at it (B) a person walking by it (C) a person looking at it intently (D) a person cranking up the room heater

Output: D


Input: Consider Input: A pigeon is hungry so it snags a slice of pizza off a table using its (A) wing (B) teeth (C) beak (D) leg

Output: C


Input: Consider Input: What is a source of energy for animals? (A) food charts (B) fire (C) grasshoppers (D) gales


Output: C