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
[{'content': "ANCA positive vasculitis \nSelect and explain. \nA. Henoch schonlein purpura, B. Behcet's syndrome, C. Wegener's granulomatosis, D. All", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Wegener's granulomatosis", 'role': 'assistant'}]