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
Most common cause of acute retention of urine in child of 2 year age - 
Select and explain. 
A. Posterior urethral valve, B. Duplication of renal pelvis, C. Meatal ulceration with scabbing, D. Urethral stones
C: Meatal ulceration with scabbing
Answer: C: Meatal ulceration with scabbing 
Explanation: Ans. is 'c' i.e., Meatal ulceratin with scabing o Dont get confuse by option 'a' ? Though posterior urethral valve is the most common cause of obstructive uropathy in children, it does not cause acute retention. It usually presents with chronic obstructive symptoms weak urinary stream, distended bladder, uremia or sepsis caused by infection in the obstructed urinary tract. o Meatal ulceration with scabbing can cause acute retention of urine. o Urethral stone may cause obstruction, but the most common presentation is hematuria with or without pain.