Pathology General c812e979 Which is not a tumour marker - A Carcinoembryonic antigen (CEA) B Human Chorionic Gonadotropin (hCG) C β2Microglobulin D α Fetoprotein (AFP) High-Yield Explanation Note : β2 microglobulin (Monoclonal immunoglobulin) is used in multiple myeloma.