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
Which of the following malignant ovarian germ cell tumor variants has the best prognosis 
Select and explain. 
A. Yolk Sac tumor, B. Dysgerminoma, C. Immature teratoma, D. Mature teratoma
B: Dysgerminoma
Answer: B: Dysgerminoma 
Explanation: Dysgerminomas have the best prognosis of all malignant ovarian germ cell tumors.