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': 'Tumour marker for Endodermal Sinus Tumour \nSelect and explain. \nA. CEA, B. HCG, C. Alfa feto protein, D. Cytokeratin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Endodermal sinus tumor (yolk sac tumor) is positive for AFP and α1\xa0- antitrypsin.', 'role': 'assistant'}]