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
Method of choice for a New born child not passing urine for 36 hours : 
Select and explain. 
A. Ultrasound of kidney & bladder, B. CT Scan, C. Cystoscopy, D. X–ray pelvis
A: Ultrasound of kidney & bladder
Answer: A: Ultrasound of kidney & bladder 
Explanation: A history of Anuria suggests Acute Renal failure.
Ultrasonography is the ideal imaging tool in Renal failure because of its non dependence on Renal function.
As it allows visualization of :

Pelvicalyceal system ofAssessment of Renal Size o Structural anomalies and calculi .
Note - In this question DTPA scan has not been provided as an option. So, the best answer is USG.