This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumor Markers, Subject name: Gynaecology & Obstetrics
[{'content': 'Tumor markers of ovarian cancer is- \nSelect and explain. \nA. CA125, B. CA19-9, C. AFP, D. hCG', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., CA 125", 'role': 'assistant'}]