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
Which is not a feature of posterior urethral valve: 
Select and explain. 
A. Palpable bladder, B. Painful stress incontinence, C. Recurrent UTI, D. Hydronephrosis
B: Painful stress incontinence
Answer: B: Painful stress incontinence 
Explanation: b. Painful stress incontinence(Ref: Nelson's 20/e p 2562-2567, 2573, Ghai 8/e p 485-486)High Yield Points:Posterior urethral valves are the commonest cause of lower urinary tract obstruction in boys.In PUV, Prostatic urethra dilates, & bladder muscle undergoes hypertrophy; Hydronephrosis or renal dysplasia may also develop;Vesicoureteral reflux occurs in 50% and 30% of patients experience end stage renal disease or chronic renal insufficiency.