This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Medicine
All of the following are minor criteria for multiple myeloma except - 
Select and explain. 
A. Plasmacytosis 20%, B. Multiple lytic lesion, C. IgA < 100 mg/dl and IgG < 600 mg/dl, D. Plasmacytoma on tissue biopsy
D: Plasmacytoma on tissue biopsy
Answer: D: Plasmacytoma on tissue biopsy 
Explanation: Final Diagnosis -- Nonsecretory multiple myeloma. Diagnostic requirements: The diagnosis of multiple myeloma requires a minimum of one major criterion and one minor criterion, or three minor criteria which must include bone marrow plasmacytosis of 10-30 percent and the presence of a monoclonal protein. Ref Davidson 23rd edition pg 789