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': 'All of the following are tumor markers, except \nSelect and explain. \nA. CEA, B. HCG, C. Alpha-fetoprotein, D. Beta-2 macroglobulin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Beta-2 microglobulin and not beta macroglobulin may be used as a tumor marker (as in multiple myeloma).', 'role': 'assistant'}]