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': 'Excitatory Neurotransmitter in CNS- \nSelect and explain. \nA. Acetyl choline, B. Glycine, C. GABA, D. Glutamate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Glutamate is the chief excitatory neurotransmitter in CNS.', 'role': 'assistant'}]