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: Pediatrics
[{'content': 'Germ cell tumor(s) of paediatric includes all except – \nSelect and explain. \nA. Pure yolk sac tumor, B. Leydig cell tumor, C. Choriocarcinoma, D. Embryonal cell carcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Germ cell tumors \n\nGerm cell tumors, as the name suggests, arise from Primordial germ cells (Precursor germ cells or gametocytes),\nGerm cells develops early in life. In growing fetus, germ cells migrate from their point of origin to the gondal area.\nGerm cells that still have to reach the gonads are called primordial germ cells.\nAfter reaching to gonads these become mature germ cells and the end products of germ cell cycle are the egg or sperm.\nGerm cell tumors arise from primordial germ cells.\nTherefore germ cells tumor may be : -\n\n\nGonadal (In testis or ovary)\nExtragonadal : - When primordial genn cells fail to reach the right location and divide at the site of arrest. Extra-gonadal germ cell tumors may occur at nzediastinum (most common site), retroperitonium (2nd most common site), brain, pineal gland, sacrococcygeal region.\n\n\nGerm cell tumor are : -\n\n\nSenzinoma/dysgerminoma\xa0\xa0\xa0\xa0\xa0\xa0 ❑ Embryonal carcinoma\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 ❑ Yolk/sac (endodermal sinus) tumor\n\n\nChoriocarcinoma\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 ❑ Teratoma Non-germ cell gonadal tumors \n\n\nThese tumors occur in adults. These may occur very rarely in children and occur predominantly in ovary. Tumors are\n\ni)\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Surface epithelial tumors : - Serous tumor, mucinous tumor, Brenner tumor etc. Sex cord stromal tumors : - Granulosa-theca cell tumor, Sertoli-Leydig cell tumor', 'role': 'assistant'}]