This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Medicine
[{'content': 'Which of the following antibody is incriminated in causing henoch schonlein purpura \nSelect and explain. \nA. IgA, B. IgM, C. IgG, D. IgD', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Henoch schonlein purpura(IgA vasculitis) is characterized by Paplable purpura(most commo buttocks and lower extremities) Ahralgia Gastrointestinal signs and symptoms Glomerulonephritis Pathogenesis:immune complex deposition .IgA antibody class is the most often seen in immune complexes. Ref:Harrison 20th edition pg no 2586', 'role': 'assistant'}]