Detailed Instructions: 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.
Problem:The brain, spinal cord, and nerves are organs that perform which primary function?
(A) supporting the body and enabling it to move (B) transporting oxygen, wastes, and nutrients throughout the body (C) producing male and female gametes (D) conducting messages to coordinate body functions
Solution:
D