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: Biochemistry
[{'content': 'Most common metabolite of progesterone excreted in urine is _________ \nSelect and explain. \nA. Pregnanelone, B. Pregnanetriol, C. 17-hydroxy pregnanolone, D. Pregnanediol', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Pregnanediol is an inactive metabolic product of progesterone. A test can be done to measure the amount of pregnanediol in urine, which offers an indirect way to measure progesterone levels in the body. The principal pathway of the metabolism of progesterone is believed to be progesterone - pregnanedione - pregnanolone - pregnanediol, although small amounts of the corresponding allopregnane compounds are formed.', 'role': 'assistant'}]