This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nerve Physiology, Subject name: Physiology
Renshaw cells are inhibitory interneurons found in? 
Select and explain. 
A. Gray matter of brain, B. White matter of brain, C. Gray matter of the spinal cord, D. White matter of spinal cord
C: Gray matter of the spinal cord
Answer: C: Gray matter of the spinal cord 
Explanation: ANSWER: (C) Gray matter of the spinal cordREF: Neurobiology: molecules, cells, and systems By Gary G. Matthew, Page 176-177 "Renshaw cells of grey matter of spinal cord produces self-inhibition of motor neurons.The axons of motor neurons send branches that make excitatory synaptic connection onto Renshaw cells. The Renshaw cells in turn make inhibitory synaptic connections back onto the same motor neuron"