This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
Sterile pyuria is seen in 
Select and explain. 
A. Renal TB, B. Wilms tumor, C. PID, D. Diabetes
A: Renal TB
Answer: A: Renal TB 
Explanation: Many diseases in the urinary tract produce significant pyuria in the absence of bacteriuria . whereas TB is a well recognised example of sterile pyuria , stag horn calculi and stones of smaller size can produce intense pyuria with clumps of wbc in the absence of UTI . any injury to urinary tract ,from Chlamidial urethritis to glomerulonephritis and interstitial cystitis can elicit sterile pyuria ref : Campbell- Walsh urology pa3 , chapter 12 ,pg no 251