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 rnyeloma except - \nSelect and explain. \nA. Plasmacytosis 20%, B. Multiple lytic lesion, C. IgA < 100 mg/di and IgG < 600 mg/dl, D. Plasmacytoma on tissue biopsy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]