<prompt> The most common cause of renal scarring in a 3 years old child is:TraumaTuberculosisVesicoureteral reflux induced pyelonephritisInterstitial nephritis  <response>: c. Vesicoureteral reflux induced pyelonephritisRef: Nelsons 20e p 2562-2567Ghai 8e p 485-486Most common cause of renal scarring in a child is VUR-induced pyelonephritis. 