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 material is the best conductor of electricity?  
 (A) Wood (B) Metal (C) Stone (D) Plastic

Output: B


Input: Consider Input: What season is the Northern Hemisphere experiencing when it is tilted away from the Sun?  
 (A) spring (B) summer (C) autumn (D) winter

Output: D


Input: Consider Input: Which source of energy is nonrenewable?  
 (A) coal (B) sunlight (C) water (D) wood


Output: A