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 the best tool for measuring the temperature of lake water?  
 (A) Meter stick (B) Balance (C) Graduated cylinder (D) Thermometer

Output: D


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

Output: B


Input: Consider Input: A family installs a new heating system in their home. Which is the most desirable result of the new heating system?  
 (A) producing more noise pollution (B) decreasing the amount of energy used (C) increasing the use of natural resources (D) increasing the time it takes to heat the home


Output: B