This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nephropathy, Subject name: Pediatrics
Most common cause of persistent hypertension in child with intrinsic renal disease is - 
Select and explain. 
A. CGN, B. Chronic Pyelonephritis, C. Obstructive uropathy, D. Renal tumor
B: Chronic Pyelonephritis
Answer: B: Chronic Pyelonephritis 
Explanation: Ans. is 'b' i.e., Chronic Pyelonephritis o Secondary- hypertension most common in infant and Younger Children,o New bom Cause umblical artery Catheterisation and renal artery thromosis.o Early Childhood:Renal diseaseCoartection of aortao AdolescentsRenal diseaseo In renal disease, history of urinary tract infection is present in 25-50% of pt and is often related to an obstructive lesion of urinary tract.