This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
[{'content': 'All of the following are germ cell tumours except? \nSelect and explain. \nA. Mesonephroid tumors, B. Teratoma, C. Endodermal sinus tumour, D. Dysgerminoma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Germ cell tumours include Teratoma, Dysgerminoma, Endodermal sinus tumour, Embryonal carcinoma, Polyembryoma, Choriocarcinoma and mixed forms. Mesonephroid tumour is an epithelial tumour. It is also known as clear cell carcinoma. It is an uncommon tumour of ovary. It is highly malignant. Ref: Shaw's Textbook of Gynaecology, 18th edition, p373-376", 'role': 'assistant'}]