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: Surgery
[{'content': 'A 50-year-old drug abuser presents with fever and weight loss. Exam shows hypeension, nodular skin rash, and peripheral neuropathy. ESR is 100 mm/L, and RBC casts are seen on urinalysis. The most likely condition is: \nSelect and explain. \nA. Reiter syndrome, B. Drug-induced lupus erythematosus, C. Polyaeritis nodosa, D. Behcet syndrome', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The 50-year-old gentleman is a drug abuser and also has a multisystem disease, including systemic complaints, hypeension, skin lesions, neuropathy, and an abnormal urine sediment. This complex suggests a vasculitis, paicularly polyaeritis nodosa. 20 to 30% of patients have hepatitis B antigenemia. The disease is a necrotizing vasculitis of small and medium muscular aeries. The pathology of the kidney includes an aeritis and, in some cases, a glomerulitis. Nodular skin lesions show vasculitis on biopsy.', 'role': 'assistant'}]