This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney and ureter, Subject name: Surgery
[{'content': 'Most common congenital anomaly of the upper renal tract is: \nSelect and explain. \nA. Duplication of renal pelvis, B. Duplication of ureter, C. Ectopic ureteric orifice, D. Congenital megaureter', 'role': 'user'}, {'content': 'Answer: B \nExplanation: DUPLICATION OF URETER (AD) MC congenital anomaly of upper urinary tract. Mode of inheritance is autosomal dominant. More common in females and often bilateral. Yo-Yo effect in fused ureter (incomplete duplication) is seen. Upper pole ureter is associated with Ureterocele Lower pole ureter is associated with Sho intravesical length of ureter( risk of VUR) Diagnosis IVP: shows duplication In most of cases. Treatment If function of Upper pole ureter is normal- Excision and reimplanation into the bladder If function of Upper pole ureter is impaired- upper pole nephrectomy Lower pole ureter- Ureterovesicoplasty', 'role': 'assistant'}]