You are given a science question (hard-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:
Which source of data about Nevada resources is likely to be most current and reliable?  
 (A) a science encyclopedia (B) an article in a local newspaper (C) a government-maintained website (D) a student's classroom presentation

Ex Output:
C


Ex Input:
After a soccer game, Brittany sat under a fan because she was hot. Under the fan, she felt cooler than before. Which explains why Brittany felt cooler under the fan?  
 (A) Air moving under the fan is cooler than air that is still. (B) The evaporation of sweat absorbs heat from the skin. (C) Water vapor from the fan condenses on the skin. (D) The fan speeds convection currents in the air.

Ex Output:
B


Ex Input:
Which of these has the greatest capacity for storing thermal energy from the Sun?  
 (A) air (B) land (C) oceans (D) plants

Ex Output:

C