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': "Which of the following is not a major criteria for\ndiagnosis of multiple myeloma? \nSelect and explain. \nA. Lytic bone lesions, B. Plasmacytoma on tissue biopsy, C. Bone marrow plasmacytosis > 30%, D. 'M' spike > 3g% for IgG > 2g% for IgA", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]