This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of menstruation, Subject name: Gynaecology & Obstetrics
[{'content': "Cryptomenorrhea is seen in \nSelect and explain. \nA. Asherman's syndrome, B. Testicular feminizing syndrome, C. Imperforate hymen, D. Uterine agenesis", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cryptomenorrhea means monthly subjective symptoms of menstruation without the outflow of blood.In women with cryptomenorrhoea presenting as primary amenorrhoea, the common cause is an intact hymen or vaginal septum. A history of cyclic abdominal colickypain, retention of urine, the presence of a palpable abdominal lump and the visualization of a tense bluish bulging membrane on separation of the labia enables the diagnosis.Ultrasound scan of the pelvis confirms it. A simple cruciate incision of the hymen permits free drainage of the collected menstrual blood and leads to normal reproductive function.Ref: Shaw&;s Textbook of Gynecology; 16th edition; Page no: 324', 'role': 'assistant'}]