An 80 year old asymptomatic woman was detected to have a monoclonal spike on serum electrophoresis (IgG levels 1.5 g/dl). 1: one marrow revealed plasma cells of 8%. The most likely diagnosis is -: (A) Multiple myeloma, (B) Indolent myeloma, (C) Monoclonal gammopathy of unknown significance, (D) Waldenstorrn's macroglobulinemia
Answer is C. None