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 method is the best safety procedure when working around open flames?  
 (A) wear an acid-resistant apron (B) wash your hands (C) tie back long hair (D) use an electric fan to blow gases from the flame
Example Output: C

Example Input: Which of the following is the main role of flowers found on most flowering plants?  
 (A) to take in air (B) to produce seeds (C) to absorb nutrients (D) to protect the stem
Example Output: B

Example Input: Which sentence best describes the organization of the heart?  
 (A) The heart is an organ made up of different types of tissues, each of which has different types of cells. (B) The heart is a tissue made up of different types of organs, each of which has different types of cells. (C) The heart is a system made up of one type of tissue and identical cells. (D) The heart is a tissue made up of one type of organ and identical cells.
Example Output:
A