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: Pathology
[{'content': 'Which is not a minor diagnostic criteria for multiple myeloma? \nSelect and explain. \nA. Lytic bone lesions, B. Plasmacytosis greater than 20%, C. Plasmacytoma on biopsy, D. Monoclonal globulin spike on serum melectrophoresis of >2.5 G/DL for IgG,>1.5 G/DL for IGA)', 'role': 'user'}, {'content': 'Answer: C \nExplanation: . Plasmacytoma on biopsy', 'role': 'assistant'}]