Which of the following statements correctly describes white matter and gray matter?
A. White matter in the brain and spinal cord is a concentration of myelinated axons, and gray matter in the brain and spinal cord is a concentration of myelinated dendrites.
B. Gray matter in the brain and spinal cord is a concentration of myelinated axons, and white matter in the brain and spinal cord is a concentration of dendrites.
C. White matter in the brain and spinal cord is a concentration of unmyelinated axons, and gray matter in the brain and spinal cord is a concentration of dendrites.
D. White matter in the brain and spinal cord is a concentration of myelinated axons, and gray matter in the brain and spinal cord is a concentration of dendrites.
Answer: D
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