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
[{'content': 'Which of the following is an impoant tumour marker in the diagnosis of endodermal sinus tumour: March 2011 \nSelect and explain. \nA. HCG, B. Ca-125, C. LDH, D. Alpha FetoProtein', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: Alpha Feto Protein Endodermal sinus (yolk sac) tumour is thought to originate from a multiple potential embryonal tissue as a result of selective differentiation of yolk sac structures. This explains why the tumour is rich in alpha-fetoprotein and alphal antitrypsin', 'role': 'assistant'}]