This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pathology (Carcinoma Ovary), Subject name: Gynaecology & Obstetrics
Which of the following is the most common malignant germ cell tumor of ovary? 
Select and explain. 
A. Yolk sac tumor, B. Dysgerminoma, C. Polyembryoma, D. Choriocarcinoma
B: Dysgerminoma
Answer: B: Dysgerminoma 
Explanation: Ans. is 'b' i.e., Dysgerminoma Dvsgerminomao It is the most common malignant germ cell tumor of ovary,o It affects young women and is usually unilateral.o Bilateral tumors are seen in 15 - 20% of the cases.o It is fleshy in consistency.o Histologically it shows presence of lymphocytic infiltration which is considered a good prognostic sign.