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
[{'content': 'True about endodermal sinus tumors : \nSelect and explain. \nA. Schiller duval bodies seen, B. It is a benign tumour, C. HCG, D. It is seen in young individuals', 'role': 'user'}, {'content': 'Answer: A \nExplanation: -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', 'role': 'assistant'}]