A myelinated nerve fiber is ________, whereas an unmyelinated nerve fiber is ________.
A. gray, and composing the gray matter of the brain and spinal cord; white, and composing the white matter of the brain and spinal cord
B. white, and composing the gray matter of the brain and spinal cord; red, and composing the white matter of the brain and spinal cord
C. white, and composing the gray matter of the brain and spinal cord; gray, and composing the white matter of the brain and spinal cord
D. white, and composing the white matter of the brain and spinal cord; gray, and composing the gray matter of the brain and spinal cord
Answer: D
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