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': 'Most common heavy chain disease is \nSelect and explain. \nA. Franklin disease, B. Seligmann disease, C. Mu heavy chain disease, D. Waldenstrom cryoglobulinemia', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Seligmann Disease (Alpha heavy chain disease)", 'role': 'assistant'}]