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: What type of galaxy is the Milky Way?  
 (A) spiral (B) elliptical (C) irregular (D) oval

Output: A


Input: Consider Input: A scientist combines oxygen and hydrogen to form water. This combination illustrates that water is  
 (A) an atom. (B) an element. (C) a mixture. (D) a compound.

Output: D


Input: Consider Input: Earth, along with the other planets, revolves around the Sun. The planets revolve in a counterclockwise direction. The cause of the revolution is mostly due to which force?  
 (A) electrical (B) frictional (C) gravitational (D) magnetic


Output: C