Not affected in multiple myeloma -: (A) IgG, (B) IgA, (C) IgM, (D) IgD
Answer is C. Types of monoclonal protein in multiple myeloma include IgG,(55%),IgA(21%), light chain only(22%), others(D,E,non-secretory about 2%).Reference :Davidson's principles & practice of medicine 22nd edition pg no 1046.