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': 'In case of secondary amenorrhea who fails to get withdrawal bleeding after taking Estrogen and Progesterone, the fault lies at the level of \nSelect and explain. \nA. Pituitary, B. Endometrium, C. Ovary, D. Hypothalamus', 'role': 'user'}, {'content': "Answer: B \nExplanation: Secondary Amenorrhea\nDefinition:\n\nIn women who have menstruated previously, no menses for an interval of time equivalent to a total of at least three previous cycles or 6 months\nUterus must contain a functional endometrium that can respond to the actions of ovarian sex steroid hormones, estrogen and progesterone\nWhen estrogen and progesterone both were given and no menstruation at the end, the pathology lies in the endometrium\n\nCauses:\n\nTuberculosis, Schistosomiasis\nPostabortal or puerperal curettage\nAsherman's syndrome", 'role': 'assistant'}]