You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

Ex Input:
Which of the following best describes a role of mushrooms in ecosystems?
(A) capturing energy from sunlight (B) consuming living plant material (C) taking energy from animal hosts (D) breaking down dead plant material

Ex Output:
D

Ex Input:
Which of the following helps the body to cool down?
(A) shivering (B) sweating (C) running a fever (D) taking deep breaths

Ex Output:
B

Ex Input:
The diet of a brown bear includes roots, grasses, berries, nuts, fish, insects, and mammals. Based on this description, in what category is a brown bear?
(A) carnivore (B) herbivore (C) omnivore (D) decomposer

Ex Output:
C