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': 'Most common endometrial pattern in dysfunctional uterine bleeding: \nSelect and explain. \nA. Normal, B. Hyperplastic with Swiss-Cheese pattern, C. Nonsecretory, D. Atrophic', 'role': 'user'}, {'content': "Answer: A \nExplanation: Endometrial study in DUB Endometrial sampling performed after 5th or 6th day of the onset of menstruation reveals a mixture of secretory and proliferative endometrium absence of any surface epithelium Endometrial study prior or soon after spotting reveals patchy area of secretory changes amidst proliferative endometrium D.C.DUTTA'S TEXTBOOK OF GYNECOLOGY,Pg no:188,6th edition", 'role': 'assistant'}]