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': 'A testicular tumor marker is - \nSelect and explain. \nA. a-Fetoprotein, B. Ectopic hormones, C. CEA, D. Testosterone', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., a-Fetoproteins", 'role': 'assistant'}]