This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Vessels, Subject name: Pathology
Which one is found in HSP? 
Select and explain. 
A. IgA, B. IgM, C. IgG, D. IgE
A: IgA
Answer: A: IgA 
Explanation: Ans. (a) IgA(Ref: Robbins 9th/pg 926; 8th/pg 934)Most common antibody seen in these immune complexes is IgA Q (IgA levels are elevated)The microscopic hallmark of HSP is the deposition of IgA in the walls Q of involved blood vessels.