Necrotizing pappillitis may be seen in all of the following conditions except -
Sickle cell disease
Tuberculous pyelonephritis
Diabetes mellitus
Analgesic nephropathy
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.