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': 'The highest density of glutamate receptors in basal ganglia are found in \nSelect and explain. \nA. Substantia nigra, B. Globus pallidus interna, C. Globus pallidus externa, D. Putamen', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Putamen', 'role': 'assistant'}]