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 features of Monoclonal Gammopathy of Undetermined Significance (MGUS), EXCEPT: \nSelect and explain. \nA. M protein in serum, B. Bone marrow clonal plasma cells >10%, C. No evidence of other B cell proliferative disorders, D. No myeloma-related organ or tissue impairment', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Bone marrow plasma cells are less than 10 % in MGUS. Ref:Harrisons Principles of Internal Medicine, 18th Edition, Page 940', 'role': 'assistant'}]