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: Pathology
[{'content': 'Which is not a tumour marker - \nSelect and explain. \nA. Carcinoembryonic antigen (CEA), B. Human Chorionic Gonadotropin (hCG), C. β2Microglobulin, D. α Fetoprotein (AFP)', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Note :\xa0β2\xa0microglobulin (Monoclonal immunoglobulin) is used in multiple myeloma.', 'role': 'assistant'}]