This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': 'Posterior urethral valve is diagnosed on micturating cystometrogram by- \nSelect and explain. \nA. Dilatation of posterior urethra, B. Bladder neck contracture, C. Vesico-Ureteric reflex, D. Bladder wall hyperophy', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Dilatation of posterior urethra Micturating cystourethrogram findings i) Dilation of prostatic urethra ii) Transverse linear filling defect corresponding to the valves.", 'role': 'assistant'}]