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:
What kind of energy conversion occurs after a candle is lit?  
 (A) friction to electrical energy (B) light energy to heat energy (C) mass to kinetic energy (D) chemical energy to light energy

Ex Output:
D


Ex Input:
Which property of air does a barometer measure?  
 (A) speed (B) pressure (C) humidity (D) temperature

Ex Output:
B


Ex Input:
A magnet can generate an electric current in a wire if the magnet is close enough to the wire and if the magnet is also  
 (A) strong. (B) weak. (C) at rest. (D) in motion.

Ex Output:

D