This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary tract, Subject name: Pathology
[{'content': 'A glomerulus-like structure composed of central blood vessel enveloped by germ cells within a space lined by germ cells, is seen in- \nSelect and explain. \nA. Seoli-Leydig cell tumor, B. Granulosa cell tumor, C. Endodermal sinus tumor, D. Sex cord tumor with annular tubules', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Endodermal Sinus (Yolk Sac) Tumor: it is the second most common malignant tumor of germ cell tumor. Endodermal sinus tumor: Malignant aggressive, rapidly growing germ cell tumor. Can also occur in testis. Endodermal sinus tumor: 1. Schiller-Duval body: Glomerulus-like structure composed of a central blood vessel enveloped by germ cells within a space lined by germ cells. 2. PAS-positive hyaline droplets. Tumor Marker: 1. a-fetoprotein 2. a1-antitrypsin. Ref: RAM DAS NAYAK EXAM PREPARATORY MANUAL FOR UNDERGRADUATES 2nd ed. pg no: 683,684', 'role': 'assistant'}]