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: The Grand Canyon is an example of  
 (A) erosion. (B) deposition. (C) an earthquake. (D) volcanic activity.

Output: A


Input: Consider Input: A student conducts an investigation using mold spores. In one part of the investigation, he needs to closely examine a spore sample. Which piece of equipment does the student need to use to keep mold spores from entering his respiratory system?  
 (A) breathing mask (B) safety goggles (C) rubber gloves (D) lead smock

Output: A


Input: Consider Input: Bile salts play a crucial role in gastrointestinal homeostasis and digestion. Which phrase is the best description of the gastrointestinal function of bile salts?  
 (A) digestion and absorption of proteins in the liver (B) digestion and absorption of fats in the small intestine (C) digestion and absorption of carbohydrates in the liver (D) digestion and absorption of cholesterol in the large intestine


Output: B