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.

Ex Input:
Because copper is a metal, it is  
 (A) liquid at room temperature (B) nonreactive with other substances (C) a poor conductor of electricity (D) a good conductor of heat

Ex Output:
D


Ex Input:
Which location on Earth receives the most direct sunlight?  
 (A) the deserts (B) the South Pole (C) the equator (D) the Western Hemisphere

Ex Output:
C


Ex Input:
What happens when salt water is boiled?  
 (A) The water evaporates and the salt remains in the beaker. (B) Both the salt and the water evaporate and leave the beaker. (C) The salt becomes a new compound. (D) The salt will evaporate from the water and disperse into the environment.

Ex Output:

A