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': 'Charactersitic feature of kidneys in diabetes mellitus is - \nSelect and explain. \nA. Nodular sclerosis, B. Fibrin cap, C. Papillary necrosis, D. Diffuse glomerulosclerosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]