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
True about endodermal sinus tumors : 
Select and explain. 
A. Schiller duval bodies seen, B. It is a benign tumour, C. HCG, D. It is seen in young individuals
A: Schiller duval bodies seen
Answer: A: Schiller duval bodies seen 
Explanation: -endodermal sinus tumors are also termed yolk sac tumors as they are derived from the primitive yolk sac. - the characteristic microscopic finding is the endodermal sinus or Schiller Duval body. - this is a cystic space lined with a layer of flattened endothelium into which projects a glomerulus like tuft with a central vascular core. Reference : textbook of gynaecology Sheila balakrishnan, 2nd edition, pg no: 283