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: Medicine
[{'content': 'IgA-nephropathy is seen in: \nSelect and explain. \nA. Membranous glomerulonephritis, B. Mesangioproliferative glomerulonephritis, C. Focal glomerulonephritis, D. Cresentic glomerulonephritis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer is B (Mesangioproliferative glomerulonephritis):', 'role': 'assistant'}]