This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S., Subject name: Medicine
[{'content': 'Henoch-Schonlein purpura is characterized by the deposition of the following immunoglobulin around the vessels \nSelect and explain. \nA. IgM, B. IgG, C. IgA, D. IgE', 'role': 'user'}, {'content': 'Answer: C \nExplanation: (C) IgA # In HENOCH-SCHONLEIN PURPURA Whatever the histologic lesions, the prominent feature by fluorescence microscopy is the deposition of IgA, sometimes with IgG and C3 in the mesangial region.> IgA is the antibody class most often seen in the immune complexes and has been demonstrated in the renal biopsies.', 'role': 'assistant'}]