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': 'Heavy chain disease with kapppa light chains in urine - \nSelect and explain. \nA. Mu chain disease, B. Seligman disease, C. Franklin disease, D. waldenstrom macroglobulinemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer- A. Mu chain diseaseMu HCD: Mu chain with associated light chain.', 'role': 'assistant'}]