This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological oncology, Subject name: Gynaecology & Obstetrics
[{'content': 'The most common pure germ cell tumour of the ovary : \nSelect and explain. \nA. Choriocarcinoma, B. Dysgerminoma, C. Embryonal cell tumor, D. Malignant Teratoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: - dysgerminoma is the most common among the malignant germ cell tumors accounting for 40%. - affects children and young women. Reference : Textbook of gynaecology Sheila balakrishnan, 2nd edition, pg no: 283', 'role': 'assistant'}]