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: Medicine
[{'content': 'All are associated with paraneoplastic syndromes except - \nSelect and explain. \nA. Cerebeller degeneration, B. Progressive multifocal leucoencephalopathy, C. Amyotropic lateral sclerosis, D. Opsoclonus myoclonus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]