This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Pediatrics
The most common cause of renal scarring in a 3 years old child is: 
Select and explain. 
A. Trauma, B. Tuberculosis, C. Vesicoureteral reflux induced pyelonephritis, D. Interstitial nephritis
C: Vesicoureteral reflux induced pyelonephritis
Answer: C: Vesicoureteral reflux induced pyelonephritis 
Explanation: c. Vesicoureteral reflux induced pyelonephritis(Ref: Nelson's 20/e p 2562-2567Ghai 8/e p 485-486)Most common cause of renal scarring in a child is VUR-induced pyelonephritis.