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]: Large amounts of industrial gases are released into the atmosphere every day. What happens to those gases?  
 (A) They are broken down by ultraviolet light from the Sun. (B) They are converted into nitrogen and oxygen. (C) They rise through the atmosphere and go into outer space. (D) They remain in the atmosphere for long periods of time.
[EX A]: D

[EX Q]: Animals get energy for growth and repair from  
 (A) soil (B) food (C) water (D) air
[EX A]: B

[EX Q]: Hydrogen and oxygen combine to form water. The water in this reaction is described as  
 (A) an atom (B) a reactant (C) an element (D) a compound
[EX A]:
D