This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Transplantation, Subject name: Surgery
[{'content': 'Acute cellular rejection following solid organ transplantation occurs: \nSelect and explain. \nA. Within minutes to hours of transplantation, B. Within 48 hours of transplantation, C. Between 5 to 30 days of transplantation, D. Beyond 30 days after transplantation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Between 5 to 30 days of transplantationRef: Bailey 26th edition, Pages 1408-1412* Hyperacute - minutes to hours* Acute (Cellular rejection): Most common in 5-30 days (first 6 months)* Chronic rejection after 6 months (Most common cause of graft failure)', 'role': 'assistant'}]