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
The highest density of glutamate receptors in basal ganglia are found in 
Select and explain. 
A. Substantia nigra, B. Globus pallidus interna, C. Globus pallidus externa, D. Putamen
D: Putamen
Answer: D: Putamen 
Explanation: D i.e. Putamen