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 two body systems are involved in inhaling oxygen and exhaling carbon dioxide?
(A) endocrine and skeletal (B) excretory and nervous (C) circulatory and respiratory (D) digestive and reproductive
answer:
C

question:
Which material best conducts heat and electricity?
(A) metal (B) plastic (C) rubber (D) wood
answer:
A

question:
Plankton are tiny ocean organisms. The role of one type of plankton is to use the energy from the Sun to produce food that other animals eat. Which organism has the same role in the ocean as this type of plankton?
(A) seaweed (B) turtle (C) dolphin (D) crab
answer:
A