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 force pulls things towards the center of Earth?  
 (A) magnetism (B) gravity (C) friction (D) energy

Output: B


Input: Consider Input: Which scientist is credited with using a telescope in the seventeenth century to discover the moons of Jupiter?  
 (A) Galileo (B) Kepler (C) Einstein (D) Newton

Output: A


Input: Consider Input: Jonathan places a pot of water on a stove. As the water boils, how does the state of the water change?  
 (A) from gas to liquid (B) from liquid to gas (C) from liquid to solid (D) from solid to liquid


Output: B