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': "Malignant germ cell tumours of ovary includes all of the following except:a)  Choriocarcinoma b) Arrhenoblastomac) Brenner's tumord) Serous cystadenomae) Teratoma \nSelect and explain. \nA. abc, B. acd, C. ac, D. bcd", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Germ cell Tumors of ovary:\nMnemonic: YES PCT\nY - Yolk sac Tumor (Endodermal sinus Tm)\nE - Embroyonal carcinoma\nS - Seminoma ≈ Dysgerminoma\nP - Polyembryoma\nC - Choriocarcinoma\nT - Teratoma ≈ Dermoid\nIn contrast to slow growing epithelial ovarian tumors, germ cell malignancies grow rapidly and are characterised by subacute pelvic pain.\n• Most common germ cell Tumor – Mature teratoma or Dermoid cyst\xa0(Benign in nature).\n• Most common malignant GCT – Dysgerminoma.\n• Second most common malignant GCT – Endodermal sinus Tumor. (Yolk Sac tumor)\n• Most common benign Tumor of ovary – Dermoid cyst', 'role': 'assistant'}]