This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Pathology
[{'content': 'The tumor marker for Endodermal sinus tumor is \nSelect and explain. \nA. HCG, B. CEA, C. cytokein, D. Alpha fetoprotein', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Endodermal sinus Tumors often have eosinophilic hyaline globules in which a1-antitrypsin and alpha fetoprotein (AFP) can be demonstrated by immunohistochemical techniques. As mentioned later, AFP can also be detected in the serum .Serum AFP is a very good tumor marker in patients with germ cell tumors composed of or containing endodermal sinus (yolk sac) tumor, irrespective of their location. ref : Robbins Basic Pathology, 9E,page-661', 'role': 'assistant'}]