This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chronic Kidney Disease & Diabetic Nephropathy, Subject name: Medicine
[{'content': 'Acute auto-graft rejection occurs within? \nSelect and explain. \nA. Few hours, B. < 1 month, C. < 6 months, D. 6-12 months', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hypersensitivity reaction Time 1. Hyperacute II Minutes 2. Acute IV <6 months 3. Chronic IV >6 months', 'role': 'assistant'}]