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.

Input: Consider Input: A student finds an animal in the wild. He decides it is a bird because it has
(A) fins. (B) scales. (C) feathers. (D) four legs.

Output: C

Input: Consider Input: In the morning, students observed puddles of water all over the playground. What would best explain why the playground was dry in the afternoon?
(A) Animals drank the water. (B) The wind stopped blowing. (C) Someone dried the puddles. (D) The water evaporated during the day.

Output: D

Input: Consider Input: Prolonged exercise stimulates muscle cells to absorb sugar from the blood. This mechanism reduces stress placed on the body by signaling the body to produce
(A) insulin. (B) lipids. (C) hemoglobin. (D) hydrochloric acid.
Output: A