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. CEA, B. Tyrosinase, C. Human leucocyte antigen A2, D. AFP', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]