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.

Example Input: Which describes a specific characteristic necessary for survival in the desert?  
 (A) conserving water (B) hiding from predators (C) hibernating for long periods (D) producing many offspring
Example Output: A

Example Input: What is a decomposer?  
 (A) a living thing that breaks down dead organisms (B) a living thing that makes its own food (C) an animal that eats live plants (D) an animal that hunts other animals
Example Output: A

Example Input: Which factor will most likely cause a person to develop a fever?   
 (A) a leg muscle relaxing after exercise (B) a bacterial population in the bloodstream (C) several viral particles on the skin (D) carbohydrates being digested in the stomach
Example Output:
B