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: Gynaecology & Obstetrics
[{'content': 'Increase Alfa - fetoprotein is seen in all except : \nSelect and explain. \nA. Open spina bifida, B. Dysgerminoma, C. Endodermal sinus tumor, D. Bronchial aplasia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dysgerminoma', 'role': 'assistant'}]