This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Primary Amenorrhea, Subject name: Gynaecology & Obstetrics
[{'content': 'Cryptomenorrhoea is most commonly seen with: \nSelect and explain. \nA. Imperforate hymen, B. Asherman syndrome, C. PCOD, D. Vaginal agenesis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: a (Imperforate hymen) Ref: Shaw, 13th ed,p.280In women with cryptomenorrhoea presenting as primary amenorrhoea the commonest cause is a intact hymen.Imperforate hymenClinical features1deg amenorrhoeaUrinary retentionPeriodic lower abdominal painSign: Visualization of tense bluish bulging membrane on separation of labia.Newborn - Mucocolpos (with in one week of birth)Diagnosis: USG pelvisTreatment of imperforate hymen: Cruciate incision on hymen(Commonest site at which hymen ruptures during intercourse - postero lateral area)', 'role': 'assistant'}]