The structures that contain grey matter and white matter are found in the
- reproductive system.
-
nervous system.
- respiratory system.
- digestive system.
The correct answer is: B
Explanation
The brain and spinal cord contain gray matter and white matter. The two make up the CNS. In the spinal cord, white matter sits external to the gray matter, while it lies deeper to the gray matter of the cerebral cortex, the outer layer of the brain.