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.

Input: Consider Input: Which is an example of a chemical reaction?
(A) Vinegar added to baking soda forms a gas. (B) Water evaporates into air. (C) Sugar dissolves in water. (D) Corn kernels are crushed to form flour.

Output: A

Input: Consider Input: When a person speaks, the type of wave produced can be described as all these except
(A) transverse. (B) mechanical. (C) compression. (D) longitudinal.

Output: A

Input: Consider Input: Above a continent, a warm air mass slowly passes over a cold air mass. As the warm air begins to cool, clouds form. What will most likely happen next?
(A) Rain will fall. (B) Hurricanes will form. (C) Lightning will strike. (D) Hail will form.
Output: A