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: Medicine
[{'content': 'All of the following features may be used to distinguish PAN from microscopic Polyangitis, Except: \nSelect and explain. \nA. ANCA positivity, B. RBC cast in urine, C. Necritizing vasculitis, D. HBV infection', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer is C (Necrotizing vasulitis): Both polyaeritis nodosa and microscopic polyangitis are characterized by histologicaly by necrotizing vasculitis. Clinical Features PAN MPA Kidney Involvement * Renal vasculitis with infarcts and microaneurysms Yes No * Rapidly progressive glomerulonephritis with crescents No Yes Lung involvement * Alveolar hemorrhage No Yes Laboratory data Yes (10%) No * HBV-infection * ANCA Negative Positive (p-ANCA) Abnormal angiogram with microaneurysms Yes No * Histology Necrotizing vasculitis Necrotizing vasculitis (no granulomas) * Relapses Rare Common', 'role': 'assistant'}]