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: Gynaecology & Obstetrics
Tumour marker of endodermal sinus tumour of ovary : 
Select and explain. 
A. a feto proteins, B. CA 125, C. HCG, D. CEA
A: a feto proteins
Answer: A: a feto proteins 
Explanation: a feto proteins