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
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: 
Select and explain. 
A. Mayer Rockitansky Kuster Hauser syndrome, B. Testicular feminization syndrome, C. Imperforate hymen, D. Asherman's syndrome
C: Imperforate hymen
Answer: C: Imperforate hymen 
Explanation: 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.