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
Straining and dribbling of urine in a male infant with recurrent urinary infection should lead to the suspicion of : 
Select and explain. 
A. Vesico – ureteric reflux, B. Posterior urethral valve, C. Pelvic ureteric junction obstruction, D. Phimosis
B: Posterior urethral valve
Answer: B: Posterior urethral valve 
Explanation: The informations provided in this question are :


Straining —> Sign of obstruction
Driblling  —>  Sign of obstruction and incomplete bladder emptying.
UTI May be due to urinary obstruction.


All these suggest the diagnosis of obstructive uropathy, and posterior urethral valve is most common cause of obstructive uropathy.