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 body systems are most involved in the response when someone stubs his or her toe?
(A) nervous and muscle (B) muscle and endocrine (C) nervous and digestive (D) reproductive and circulatory
answer:
A

question:
The first telescopes were invented hundreds of years ago. Which was discovered as a result of this invention?
(A) the moons of Jupiter (B) the bacteria that causes disease (C) the deep-sea trenches in the ocean (D) the parts of a plant that perform photosynthesis
answer:
A

question:
The Milky Way Galaxy looks like a band of light across the sky. Which observation would provide the best view of this band of light without a telescope?
(A) observing only near the north or south pole (B) observing only during a lunar or solar eclipse (C) observing on any sunny, clear day (D) observing on any dark, clear night
answer:
D