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
Henoch-Schonlein purpura is characterized by the deposition of the following immunoglobulin around the vessels 
Select and explain. 
A. IgM, B. IgG, C. IgA, D. IgE
C: IgA
Answer: C: IgA 
Explanation: (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.