This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Inhibitory neurotransmitter in CNS (Spinal cord): 
Select and explain. 
A. Glutamic acid, B. Glycine, C. Histidine, D. GABA
B: Glycine
Answer: B: Glycine 
Explanation: Glutamate—excitatory neurotransmitter in CNS.
Glycine— Inhibitory neurotransmitter in CNS. Causes hyperpolarization by increasing chloride ion conductance.
GABA— Inhibitory neurotransmitter in brain.