You are given a science question (hard-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 the best piece of equipment to determine the topography of the United States?  
 (A) radar (B) compass (C) satellite (D) radio

Output: C


Input: Consider Input: What is one condition necessary to produce diamonds?  
 (A) high altitude (B) intense pressure (C) quick cooling (D) low temperatures

Output: B


Input: Consider Input: Patrick broke his wrist skateboarding. The doctor told Patrick to eat foods rich in vitamin D while his wrist heals. Which type of food will help Patrick's wrist heal?  
 (A) green vegetables (B) dairy products (C) lean meats (D) whole grains


Output: B