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
The most common pure germ cell tumour of the ovary : 
Select and explain. 
A. Choriocarcinoma, B. Dysgerminoma, C. Embryonal cell tumor, D. Malignant Teratoma
B: Dysgerminoma
Answer: B: Dysgerminoma 
Explanation: - 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