This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, 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: Alp is used as serum tumour marker in some conditions . Ref - harrison's internal medicine 20e p441 , Davidson's medicine 23e p1324", 'role': 'assistant'}]