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': 'All of the following are minor criteria for multiple Myeloma, Except \nSelect and explain. \nA. Plasmacytosis 20%, B. Multiple lytic lesions, C. Plasmacytoma on tissue biopsy, D. Monoclonal Ig spike < 2g/dl for IgA and < 3.5 for IgG', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer is C (Plasmacytoma on tissue biopsy) Plasmacytoma or tissue biopsy is a major criterion for diagnosis of multiple myeloma (and not a minor criterion)', 'role': 'assistant'}]