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': 'Withdrawal bleeding following administration of progestogen in a case of secondary amenorrhoea indicates all except: \nSelect and explain. \nA. Absence of pregnancy, B. Production of endogenous estrogen,, C. Endometrium is responsive to estrogen, D. Defect in pituitary gonadal axis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]