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
All are germ cell tumours of ovary EXCEPT : 
Select and explain. 
A. Brenner's tumour, B. Dysgerminoma, C. Polyembryoma, D. Endodermal sinus tumor
A: Brenner's tumour
Answer: A: Brenner's tumour 
Explanation: Brenner's tumour