instruction:
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.
question:
Which organ is made mostly of muscle?  
 (A) heart (B) lung (C) ear (D) brain
answer:
A


question:
Which is a way the agricultural biotechnology industry could have a positive impact on the environment?  
 (A) by producing crops that are virus resistant (B) by making robots to replace large farm machines (C) by reducing the need for countries to import food (D) by increasing the use of wind farms that produce electricity
answer:
C


question:
In the human body, cellular respiration breaks down sugar molecules after they enter the cell. What results from this process?  
 (A) growth of bacteria (B) release of energy (C) activity of enzymes (D) production of oxygen
answer:

B