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
Post menopausal estrogen production is due to : 
Select and explain. 
A. Peripheral aromatization of androstenedione, B. Adrenal - direct production, C. Ovarian tumor, D. Ovary testosterone secretion
A: Peripheral aromatization of androstenedione
Answer: A: Peripheral aromatization of androstenedione 
Explanation: In menopause estrogen levels decrease by 66%.
Main source of estrogen production postmenopausaly is by peripheral aromatization of androstenedione.
Main estrogen after menopause - oestrone.