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
In AUB, there is : 
Select and explain. 
A. Increased estrogen, B. Decreased receptors of progesterone, C. Decreased receptors of estrogen, D. Pituitary imbalance of hormones
A: Increased estrogen
Answer: A: Increased estrogen 
Explanation: Most Common cause of AUB is anovulatory cycles with excessive or unopposed action of oestrogen on the endometrium Reference: Shaw&;s textbook of Gynaecology; 15th edition; Pg no:301