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': 'Females with vaginal atresia are characterized by all except \nSelect and explain. \nA. Lack lower portion of vagina., B. Normal external genitalia., C. Normal pubertal maturation., D. Becomes apparent in 1st decade.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Vaginal atresia doesnot become apparent until menarche.', 'role': 'assistant'}]