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': 'Henoch Schonlein purpura presents with deposition of? \nSelect and explain. \nA. IgG, B. Ig A, C. IgM, D. IgE', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ig A REF: Harrison's 17th ed chapter 319, CURRENT Medical Diagnosis & Treatment Chapter 20. Musculoskeletal & Immunologic Disorders Henoch-Schonlein purpura, the most common systemic vasculitis in children, occurs in adults as well. Typical features are palpable purpura, abdominal pain, ahritis, and hematuria. Pathologic features include leukocytoclastic vasculitis with IgA deposition. The cause is not known.", 'role': 'assistant'}]