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: Pathology
Most common ovarian tumor in young lady is ? 
Select and explain. 
A. Dysgerminoma, B. Ovarian Mucinous Cystadenocarcinoma, C. Ovarian Serous Cystadenocarcinoma, D. Fibroid
A: Dysgerminoma
Answer: A: Dysgerminoma 
Explanation: Ans. is 'a' i.e., Dysgerminoma Dysgerminoma is the ovarian counterpa of testicular seminoma. Dysgerminomas account for about 2% of ovarian cancers and roughly 50% of malignant ovarian germ cell tumors. They may occur in childhood, but 75% occur in the second and third decades of life. They are usually unilateral. All dysgerminomas are malignant. They are extremely radiosensitive.