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': 'Physiological amenorrhea is presentin all except: \nSelect and explain. \nA. Pregnancy, B. Lactation, C. Pre-pubey, D. Post-pubey', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Post-pubey', 'role': 'assistant'}]