This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
A 8 year old male had non blanching rashes over the shin and swelling of knee joint with haematuria and protein +. 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 TgA, D. Basement membrane thickening
C: Mesangial deposits of TgA
Answer: C: Mesangial deposits of TgA 
Explanation: Ans. is 'c' i.e., Mesangial deposits of IgA o This child has --> i) Rash ii) Ahritis (swelling of knee joint) iii) Haematuria o All these suggest the diagnosis of Henoch Schonlein purpura o HSP is characterized by deposition of IgA in the mesangium.