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 of the following is not a tumor marker \nSelect and explain. \nA. Tyrosinase, B. Human leucocyte antigen A2, C. AFP, D. All', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Human leucocyte antigen A2", 'role': 'assistant'}]