This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2017, Subject name: Gynaecology & Obstetrics
18 year old female presents with an ovarian mass, her serum bio marker are found to be normal except for LDH, which is found to be elevated. The most likely diagnosis is: 
Select and explain. 
A. Dysgerminoma, B. Endodermal sinus tumor, C. Malignant terratoma, D. Mucinous cystadeno carcinoma
A: Dysgerminoma
Answer: A: Dysgerminoma 
Explanation: NOTE :- * Young girls with - Germ cell tumor Ovarian mass * Old women with - Epithelial serous tumor Ovarian mass Biomarkers Dysgerminoma | LDH, | placental alkaline Po4 Endodermal sinus tumor a feto protein and antitrypsin