This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological oncology, Subject name: Gynaecology & Obstetrics
[{'content': 'Most common cause of postmenopausal bleeding is \nSelect and explain. \nA. Endometrial cancer, B. Endometrial polyps, C. Endometrial atrophy, D. Endometrial hyperplasia', 'role': 'user'}, {'content': "Answer: C \nExplanation: Causes of Postmenopausal Uterine BleedingCausesPercentageEndometrial atrophy60-80Estrogen replacement therapy15-25Endometrial polyps2-12Endometrial hyperplasia5-10Endometrial cancer10Reference: Novak's gynaecology; 14th edition; Chapter 35; Uterine cancer", 'role': 'assistant'}]