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
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: None