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: Pathology
Mesangial deposition of electron dense substance seen in? 
Select and explain. 
A. IgA nephropathy, B. Membranous nephropathy, C. Minimal change disease, D. Post streptococcal glomerulonephritis
A: IgA nephropathy
Answer: A: IgA nephropathy 
Explanation: Ans. is 'a' i.e., IgA nephropathyIgA Nephropathy: shows presence of electron dense deposits in the mesangium.