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:
Cell division is necessary for an organism to  
 (A) obtain nutrients. (B) grow and reproduce. (C) make proteins. (D) conserve matter and energy.

Ex Output:
B


Ex Input:
Which of the following forms of energy is released or absorbed in most chemical reactions?      
 (A) light energy (B) electrical energy (C) sound energy (D) heat energy

Ex Output:
D


Ex Input:
Wire was looped several times around an iron nail, and the wire's ends were connected to a battery. For which of these will this device most likely be used?  
 (A) to produce a heat source (B) to demonstrate frictional forces (C) to create a magnetic field (D) to generate a sound wave

Ex Output:

C