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
Most common cause of postmenopausal bleeding is 
Select and explain. 
A. Endometrial cancer, B. Endometrial polyps, C. Endometrial atrophy, D. Endometrial hyperplasia
C: Endometrial atrophy
Answer: C: Endometrial atrophy 
Explanation: Causes of Postmenopausal Uterine BleedingCausesPercentageEndometrial atrophy60-80Estrogen replacement therapy15-25Endometrial polyps2-12Endometrial hyperplasia5-10Endometrial cancer10Reference: Novak's gynaecology; 14th edition; Chapter 35; Uterine cancer