This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Pediatrics
[{'content': 'A male child presents with repeated urinary infections and failure to gain weight. A MCU was carried out as shown in plate, most probable diagnosis is? \nSelect and explain. \nA. Posterior urethral valve, B. Meatal stenosis, C. Bladder diverticula, D. Bladder polyp', 'role': 'user'}, {'content': "Answer: A \nExplanation: a. Posterior urethral valve(Ref: Nelson's 20/e p 2562-2567, Ghai 8/e p 485-486)Voiding cystourethrogram in an infant with posterior urethral valves showing the dilation of the prostatic urethra and the transverse linear filling defect corresponding to the valves.", 'role': 'assistant'}]