This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Radiology
[{'content': 'Basal ganglia calcification is associated with poisoning of? \nSelect and explain. \nA. Carbon dioxide, B. Carbon monoxide, C. Hydrogen sulfide, D. Sulfur dioxide', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans BCommon causes of basal ganglia calcification are aging, Fahr disease, carbon monoxide and lead poisoning, mineralizing microangiopathyMELAS, hypoparathyroidism, pseudohypoparathyroidism, TORCH infection.', 'role': 'assistant'}]