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': 'True statement (s) about posterior urethral valves in neonate \nSelect and explain. \nA. Bilateral hydronephrosis may be present, B. Creatinine & urea levels remain normal, C. Enlarge & widen prostatic urethra, D. More common in Girls', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A posterior urethral valve (PUV) is a membranous fold within the lumen of the posterior urethra that causes functional obstruction of the urine outflow. It is a common cause of obstructive uropathy in boys during the neonatal period. Pathophysiology | Bladder pressure | Wall hyperophy + Collagen deposition | | Compliance Small amounts of urine may cause large increase in bladder pressure | Bilateral Hydronephrosis Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]