This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders in Menstruation, Subject name: Gynaecology & Obstetrics
[{'content': "A 13-year-old young girl presents in the casualty with acute pain in the lower abdomen. She has history of cyclical pain for last 6 months and she has not attained her menarche yet. On local genital examination, a tense bulge in the region of hymen was seen. The most probable diagnosis is: \nSelect and explain. \nA. Mayer Rockitansky Kuster Hauser syndrome, B. Testicular feminization syndrome, C. Imperforate hymen, D. Asherman's syndrome", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is c, i.e. Imperforate hymenRef: Shaw 15th/ed, p96-97A young girl who has not attained menarche but has history of cyclical pain for last 6 months, presenting to casualty with acute abdomen and on examination a tense bulge in the region of hymen - clearly point towards "Imperforate hymen" as the diagnosis.', 'role': 'assistant'}]