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: Pediatrics
A 8 years old male had non blanching rashes over the skin and swelling of knee joint with hematuria +++ and protein + in urine. Microscopic analysis of his renal biopsy specimen is most likely to show: 
Select and explain. 
A. Tubular necrosis, B. Visceral podocyte fusion, C. Mesangial deposits of IgA, D. Basement membrane thickening
C: Mesangial deposits of IgA
Answer: C: Mesangial deposits of IgA 
Explanation: c. Mesangial deposits of IgA(Ref: Nelson's 20/e p 1612, Ghai 8/e p 632)The given case scenario (palpable purpura, arthritis, hematuria and proteinuria) suggests a diagnosis of Henoch Schonlein purpuraIn H.S. purpura and IgA nephropathy, IgA deposits are present in mesangium (by immunofluorescence)