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: Dental
[{'content': "Most common underlying neoplasm associated with paraneoplastic pemphigus is: \nSelect and explain. \nA. Thymoma, B. Non-Hodjkin's lymphoma, C. CLL, D. Medullary carcinoma of thyroid", 'role': 'user'}, {'content': 'Answer: B \nExplanation: NHL : most common neoplasm associated with paraneoplastic pemphigus', 'role': 'assistant'}]