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': 'CA - 125 is specific marker of : \nSelect and explain. \nA. Choriocarcinoma, B. Teratoma, C. Epithelial cell carcinoma of ovary, D. Seminoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is c i.e. Epithelial cell ca of ovary', 'role': 'assistant'}]