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: Radiology
[{'content': 'In idiopathic basal ganglia calcification, structure most often calcified \nSelect and explain. \nA. Caudate nucleus, B. Putamen, C. Globus pallidus, D. Striatum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Structure most often calcified - Globus pallidus.', 'role': 'assistant'}]