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: Surgery
Most common uropathic obstruction in children is 
Select and explain. 
A. Stricture, B. Stones, C. Posterior urethral valve, D. Anterior urethral valve
C: Posterior urethral valve
Answer: C: Posterior urethral valve 
Explanation: C. i.e. (Posterior urethral valve) (1362 -B & L 25th) (1289 - S. Das 5th)POSTERIOR URETHRAL VALVES are the most common obstructive urethral lesion in newborn and infants males and most common cause of end stage renal disease in boys (1008 - CSDT 12th)* They are usually just distal to the verumontanum*** Most reliable method to confirm the diagnosis is voiding cystourethrography*** Definitive treatment by transurethral resection of the valveMarion's Disease - congenital obstruction of the neck of the bladder