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: Medicine
[{'content': 'Which of the following has a normal level of alpha-fetoprotein value in serum? \nSelect and explain. \nA. Ovarian dysgerminoma, B. Hepatoblastoma, C. Embroynal carcinoma, D. Yolk sac tumours', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]