This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Introduction to Central Nervous System, Subject name: Physiology
[{'content': 'Commonest inhibitory transmitter in the spinal cord is: \nSelect and explain. \nA. GABA, B. Glycine, C. Substance P, D. Aspaate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: GABA and glycine are the most common inhibitory transmitters in the CNS.', 'role': 'assistant'}]