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': 'Pathological changes of diabetic nephropathy are all except - \nSelect and explain. \nA. Fibrin caps and capsular drops, B. Intercapillary glomerulosclerosis, C. Focal sclerosis, D. Capillary basement membrane thickening', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]