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 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: Calcium carbonate (CaCO_{3}) is considered a compound because it is made up of two or more  
 (A) molecules. (B) elements. (C) gases. (D) solids.
Example Output: B

Example Input: At concentrations of 0.1-1 µg/ml colchicine, a natural plant product, can cause the mitotic arrest of dividing cells at metaphase through disrupting the spindle apparatus. Colchicine interferes with which of these cell functions during cell division?  
 (A) microtubule organization of spindle fibers (B) DNA synthesis of spindle protein (C) membrane transport of spindle fibers (D) RNA synthesis of spindle protein
Example Output:
A