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: Which involves the greatest variety of cell types?  
 (A) a tissue (B) an organ (C) an organ system (D) an organism

Output: D


Input: Consider Input: Which of these substances is correctly identified as a mineral?  
 (A) coal (B) quartz (C) granite (D) sandstone

Output: B


Input: Consider Input: David planted ten corn seeds in sandy soil and ten corn seeds in clay soil. He kept both groups of plants at room temperature, gave them the same amount of water, and placed them all in the same sunny room. Which of the following questions is David most able to answer with his experiment?  
 (A) How much soil and water do corn seeds need to grow? (B) Do corn plants grow better in sandy soil or in clay soil? (C) Do corn plants grown in sandy soil need more water than corn plants grown in clay soil? (D) What are the effects of soil, temperature, water, and sunshine on the growth of corn plants?


Output: B