This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of menstruation, Subject name: Gynaecology & Obstetrics
[{'content': 'The investigation of choice in a 55-year-old post menopausal women who has presented with postmenopausal bleeding is : \nSelect and explain. \nA. Pap smear, B. Fractional curettage, C. Transvaginal ultrasound, D. CA-125', 'role': 'user'}, {'content': "Answer: B \nExplanation: D&C is required to rule out endometrial cancer. It is necessary in a woman complaining of menstrual disorder and postmenopausal bleeding Reference : Shaw's Textbook of Gynaecology 16th edition, page no 399.", 'role': 'assistant'}]