This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Necrotizing pappillitis may be seen in all of the following conditions except - 
Select and explain. 
A. Sickle cell disease, B. Tuberculous pyelonephritis, C. Diabetes mellitus, D. Analgesic nephropathy
B: Tuberculous pyelonephritis
Answer: B: Tuberculous pyelonephritis 
Explanation: Ans. is 'b' i.e., Tuberculous Pyelonephritiso Necrotizing pappilitis is also known as papillary necrosis.o For causes see above explanation.o Diagnostic features are -Passage of necrotic tissue in urine. Ring shadow on pyelography.