This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
[{'content': 'The type of estrogen found in highest concentration in adult female is \nSelect and explain. \nA. Estrone, B. Estriol, C. Estradiol, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: b-Estradiol; 17b-estradiol; the most potent naturally occurring estrogen in mammals, formed by the ovary, placenta, testis, and possibly the adrenal coex; therapeutic indications for estradiol are those typical of an estrogen. a-Estradiol (17a-estradiol), exhibits considerably less biologic activity.Ref: Ganong&;s review of medical physiology; 24th edition; page no: 406', 'role': 'assistant'}]