All of the following are features of Monoclonal Gammopathy of Undetermined Significance (MGUS), EXCEPT:: (A) 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
Answer is B. Bone marrow plasma cells are less than 10 % in MGUS. Ref:Harrisons Principles of Internal Medicine, 18th Edition, Page 940