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
Which of the following has a normal level of alpha fetoprotein value in serum? 
Select and explain. 
A. Ovarian dysgerminoma, B. Hepatoblastoma, C. Embroynal carcinoma, D. Yolk sac tumours
A: Ovarian dysgerminoma
Answer: A: Ovarian dysgerminoma 
Explanation: Alp is used as serum tumour marker in some conditions . Ref - harrison's internal medicine 20e p441 , Davidson's medicine 23e p1324