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
[{'content': 'A 3–year–old boy presents with fever; dysuria and gross hematuria. Physical examination shows a prominent suprapubic area which is dull on percussion. Urinalysis reveals red blood cells but no proteinuria. Which of the following is the most likely diagnosis – \nSelect and explain. \nA. Acute glomerulonepluitis, B. Urinary tract infection, C. Posterior urethral valves, D. Teratoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: It is a case of Posterior Urethral Valve presenting with Urinary tract Infection.\nPUV is the most common cause of obstructive uropathy in a male child.\nThe key to diagnosis are -\n\nAge and sex of the patient\n\nUrinary tract infection is rare in a male child, greater than one year old and less than 5 years old. Presence of urinary tract infection in this age group suggests, the presence of some obstructive uropathy. ( posterior urethral valve in this case)\n\nPresence of Suprapubic dullness\n\nPresence of suprapubic dullness suggests urinary retention, which is seen in this case due to obstruction caused by posterior urethral valves:', 'role': 'assistant'}]