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 a case of secondary amenorrhoea who fails to get withdrawal bleeding after taking estrogen and progesterone, the fault lies at the level of : \nSelect and explain. \nA. Pituitary, B. Hypothalamus, C. Ovary, D. Endometrium', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Endometrium', 'role': 'assistant'}]