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: Unknown
[{'content': 'Patient presenting with cutaneous vasculitis, glomerulonephritis, peripheral neuropathy, which of the following will help in diagnosis? \nSelect and explain. \nA. ANCA, B. RA factor, C. Hbsag, D. MIF', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref. API Textbook of Medicine. Pg. 1313\n\xa0\nCutaneous vasculitis features – Diagnosis\nAnti-neutrophil cytoplasmic antibodies (ANCAs):\n\nGroup of autoantibodies\nIgG type mainly,\nProduced against antigens in cytoplasm of neutrophil granulocytes & monocytes.\nParticularly associated with systemic vasculitis, so called “ANCA-associated vasculitis”.\nc-ANCA – Abs against MPO, p-ANCA -\xa0 Abs Against PR3', 'role': 'assistant'}]