This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Congenital malformations, Subject name: Gynaecology & Obstetrics
Emergency presentation of imperforate hymen is 
Select and explain. 
A. Retention of urine, B. Mass abdomen, C. Cyclic pain, D. Hematocolpos
A: Retention of urine
Answer: A: Retention of urine 
Explanation: Imperforate hymen present with Amenorrhea with secondary sexual characters Cyclical abdominal discomfo Retention of urine Palpation of midline hypogastric lump Ref: Shaw Gynecology 17 e pg 67.