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: Which is an example of a form of electrical energy?  
 (A) lightning (B) windmill (C) radio waves (D) sound waves

Output: A


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: Small grasshoppers shed their outer covering as they grow larger. Which animal also sheds its outer covering as it grows larger?  
 (A) frog (B) snake (C) fish (D) human


Output: B