This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological oncology, Subject name: Gynaecology & Obstetrics
All of the following are the markers for malignant germ cell tumors of ovary except: 
Select and explain. 
A. CA-125, B. Alpha fetoprotein, C. HCG, D. LDH
A: CA-125
Answer: A: CA-125 
Explanation: - most germ cell tumors secrete some tumor marker. - endodermal sinus tumors secrete alpha fetoprotein. - human chorionic gonadotrophin is secreted by choriocarcinoma. - tumors markers like placental alkaline phosphatase and lactic dehydrogenase may be elevated in dysgerminoma. - CA-125 is tumor marker in epithelial ovarian cancer. Reference : textbook of gynaecology Sheila balakrishnan, 2nd edition, pg no: 282 <\p>