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: Photosynthesis is the process that converts carbon dioxide and water into  
 (A) carbon and oxygen. (B) sugar and hydrogen. (C) sugar and oxygen. (D) nitrogen and carbon.
Example Output: C

Example Input: Which form of energy are x rays and ultraviolet light?  
 (A) nuclear (B) heat (C) electromagnetic (D) chemical
Example Output: C

Example Input: Which statement best describes the semiconservative replication sequence of the DNA sequence CCGCAT?  
 (A) identical bases in the same order (B) complementary bases in the same order (C) identical bases in the reverse order (D) complementary bases in the reverse order
Example Output:
B