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
DUB is due to : 
Select and explain. 
A. Endometriosis, B. Fibroid, C. Endometrial carcinoma, D. Irregular shedding of endometrium
D: Irregular shedding of endometrium
Answer: D: Irregular shedding of endometrium 
Explanation: Irregular shedding of endometrium