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': 'Multiple myeloma is characterized by all except: \nSelect and explain. \nA. Presence of light chains, B. Monoclonal gammopathy, C. Polyclonal gammopathy, D. Hypergammaglobulinemia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer is C (Polyclomal gammapathy) Mulitple Myeloma is characterized by monoclonal gammapathy and not polyclonal gammapathy. Multiple myeloma represents a malignant proliferation ofplasma cells derived from a single clone (monoclonal) Bone marrow cells are monoclonal', 'role': 'assistant'}]