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 the 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 IgA, D. Basement membrane thickening
C: Mesangial deposits of IgA
Answer: C: Mesangial deposits of IgA 
Explanation: This child has →

i) Rash             
ii) Arthritis (swelling of knee joint)                       
iii) Haematuria

All these suggest the diagnosis of Henoch Schonlein purpura
HSP is characterized by deposition of IgA in the mesangium.