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:
A rubber band will make a sound when it is  
 (A) vibrated. (B) stretched. (C) cut into pieces. (D) shot across a room.

Ex Output:
A


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:
Cells perform many different processes that an organism needs to survive and grow. Which is the main function of the process of cellular respiration?  
 (A) the production of sugar (B) the release of energy (C) the formation of new proteins for the cell (D) the removal of waste products from the cell

Ex Output:

B