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': 'One year old male child presented with poor urinary stream since bih. The investigation of choice for evaluation is - \nSelect and explain. \nA. Voiding cystourethrography (VCUG), B. USG bladder, C. Intravenous urography, D. Uroflowmetry', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Voiding cystourethrography o Poor urinary stream since bih suggests urinary tract obstruction (usually infravesical). o Most common cause of urinary tract obstruction in a male child is posterior urethral valve. o And the best diagnostic method for posterior urethral valve is voiding cystourethrogram.", 'role': 'assistant'}]