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:
What type of galaxy is the Milky Way?  
 (A) spiral (B) elliptical (C) irregular (D) oval
answer:
A


question:
Which form of energy are x rays and ultraviolet light?  
 (A) nuclear (B) heat (C) electromagnetic (D) chemical
answer:
C


question:
To pump blood through the body, the heart must overcome the force of gravity. Which body position would require the least work from the heart?  
 (A) sitting (B) standing (C) kneeling (D) lying down
answer:

D