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
End product of progesterone metabolism found in urine 
Select and explain. 
A. Pregnenolone, B. 17-OH Pregnenolone, C. Pregnanetriol, D. Pregnanediol
D: Pregnanediol
Answer: D: Pregnanediol 
Explanation: Fate of progesterone

Within a few minutes after secretion, almost all the progesterone is degraded to other steroids that have no progesterone effect
The major end product of progesterone degradation is pregnanediol. Approximately 10%  is excreted in urine in this form