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

Ex Output:
A


Ex Input:
When oxygen combines with hydrogen, which substance is formed?  
 (A) water (B) vinegar (C) hydrochloric acid (D) hydrogen dioxide

Ex Output:
A


Ex Input:
During an ice age, enormous ice sheets called glaciers increase in size on Earth's surface, resulting in decreased ocean depths. Due to global cooling, the water cycle is disrupted between which two stages to cause an increase in glacier size?  
 (A) runoff and evaporation (B) transpiration and precipitation (C) precipitation and runoff (D) transpiration and evaporation

Ex Output:

C