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': 'Micturating cystourethrogram shows filling defect in the urinary bladder. Likely diagnosis is________ \nSelect and explain. \nA. Sacrococcygeal teratoma, B. Vesicoureteric reflux grade II, C. Duplication of ureter, D. Ureterocele', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A ureterocele is a bih defect that affects the kidney, ureters (the tubes that carry urine from the kidneys to the bladder), andbladder. A ureterocele blocks the flow of urine resulting in swelling at the bottom of one of the ureters. Blockage that cannot be resolved and possible infection can damage the kidneys. Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]