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
[{'content': 'Sterile pyuria is seen in \nSelect and explain. \nA. Renal TB, B. Wilms tumor, C. PID, D. Diabetes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]