This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary tract, Subject name: Pediatrics
[{'content': 'Most common anomaly of upper urogenital tract is \nSelect and explain. \nA. Uretero pelvic junction stenosis, B. Ectopic uretheral opening, C. Ureterocele, D. Ectopic ureter', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The most common obstructed lateral fusion defects is unilateral obstruction and is most commonly seen in women with complete duplication of the reproductive tract(double uterus, cervix and vagina) . Unilateral UPJ obstruction is the most common prenatally detected obstructive disease, often picked up on maternal ultrasounds during pregnancy. Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]