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': 'Acute graft rejection occurs within \nSelect and explain. \nA. 3 hours, B. 3 days, C. 3 months, D. 3 years', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer- C. 3 monthsAcute rejection - It occurs 5 days to 3 months after transplantation.Both cell-mediated (cellular) rejection and humoral (antibody mediated) rejection are involved.', 'role': 'assistant'}]