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
[{'content': 'Mesangial deposition of electron dense substance seen in? \nSelect and explain. \nA. IgA nephropathy, B. Membranous nephropathy, C. Minimal change disease, D. Post streptococcal glomerulonephritis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., IgA nephropathyIgA Nephropathy: shows presence of electron dense deposits in the mesangium.", 'role': 'assistant'}]