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': 'The greatest degree of association with the severity of diabetic nephropathy in a 30-year-old diabetic is which of the following? \nSelect and explain. \nA. Duration of disease, B. Type of disease, C. Retinal involvement, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Duration of the illness contibuted to the severity and poor prognosis.', 'role': 'assistant'}]