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
[{'content': 'End product of progesterone metabolism found in urine \nSelect and explain. \nA. Pregnenolone, B. 17-OH Pregnenolone, C. Pregnanetriol, D. Pregnanediol', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Fate of progesterone\n\nWithin a few minutes after secretion, almost all the progesterone is degraded to other steroids that have no progesterone effect\nThe major end product of progesterone degradation is\xa0pregnanediol.\xa0Approximately 10% \xa0is excreted in urine in this form', 'role': 'assistant'}]