This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary tract, Subject name: Pathology
Histological feature of acute pyelonephritis are all except- 
Select and explain. 
A. Patchy interstitialy suppurative inflammation, B. Hypercellular glomerulus Intratubular aggregates of neutrophils, C. Intratubular aggregates of neutrophils, D. Tubular necrosis
B: Hypercellular glomerulus Intratubular aggregates of neutrophils
Answer: B: Hypercellular glomerulus Intratubular aggregates of neutrophils 
Explanation: Microscopy Interstitium: It shows patchy interstitial neutrophilic infiltration, which may later become extensive. Tubules: Intratubular aggregates of neutrophils form abscess with the destruction of the involved tubules->tubular necrosis. Glomeruli: They appear normal because they are relatively resistant to the infection Complications of acute pyelonephritis: 1. Papillary necrosis 2. Pyonephrosis 3. Perinephric abscess. Clinical Features Sudden onset of pain at the costoveebral angle, fever, and malaise. Dysuria, frequency, and urgency. Ref: RAM DAS NAYAK EXAM PREPARATORY MANUAL FOR UNDERGRADUATES 2nd ed. pg no: 617