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
[{'content': 'Inhibitory neurotransmitter in CNS (Spinal cord): \nSelect and explain. \nA. Glutamic acid, B. Glycine, C. Histidine, D. GABA', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Glutamate—excitatory neurotransmitter in CNS.\nGlycine— Inhibitory neurotransmitter in CNS. Causes hyperpolarization by increasing chloride ion conductance.\nGABA— Inhibitory neurotransmitter in brain.', 'role': 'assistant'}]