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 Q]: Compared to Earth, the Moon is  
 (A) drier. (B) larger. (C) heavier. (D) brighter.
[EX A]: A

[EX Q]: Which type of organism is at the lowest level of the food chain?  
 (A) autotroph (B) heterotroph (C) carnivore (D) omnivore
[EX A]: A

[EX Q]: Which of these best describes a tornado?  
 (A) A winter storm that produces frozen precipitation (B) A rotating funnel-shaped cloud with strong winds and thunderstorms (C) A severe weather condition with low temperatures and blowing snow (D) A storm that forms over warm ocean water and has extremely strong winds
[EX A]:
B