This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Testis & Scrotum, Subject name: Surgery
Alpha feto protein is a marker of 
Select and explain. 
A. Yolk sac carcinoma, B. Embryonic cell, C. Dysgerminoma, D. Choriocarcinoma
A: Yolk sac carcinoma
Answer: A: Yolk sac carcinoma 
Explanation: (Yolk sac carcinoma): (999-CSTD 13th edition; 424-Shaw's 15th)MARKERS1. Endodermal sinus (Yolk sac) tumour* Alpha-fetoprotein and alpha-1 antitrypsin2. Choriocarcinoma - hCG3. Embryonal cell carcinoma - AFP & hCG4. Dysgerminoma and pure germinomas do not secrete these markers but secretes lactose dehydrogenase