This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: New Born Infants, Subject name: Pediatrics
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(Ref: Nelson's 20/e p 1216-1217, Ghai 8/e p 632-633)Biopsy finding in HSP is deposition of IgA, specifically lgA1 in the affected tissue, by immunofluorescence, accompanied to a lesser extent by deposition of C3, fibrin & IgM.