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
Multiple myeloma is characterized by all except: 
Select and explain. 
A. Presence of light chains, B. Monoclonal gammopathy, C. Polyclonal gammopathy, D. Hypergammaglobulinemia
C: Polyclonal gammopathy
Answer: C: Polyclonal gammopathy 
Explanation: 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