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.

Ex Input:
The Great Ocean Conveyer ocean current system runs north through the Atlantic from the equatorial region. If this current got disrupted, North American and European climates would become  
 (A) rainier. (B) colder. (C) windier. (D) more humid.

Ex Output:
B


Ex 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.

Ex Output:
C


Ex Input:
Which two body systems work together to transport oxygen to the cells?  
 (A) skeletal and respiratory (B) digestive and respiratory (C) respiratory and circulatory (D) respiratory and reproductive

Ex Output:

C