This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'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 and 30 days of transplantation, D. Beyound 30 days after transplantation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: *acute graft versus host disease occurs within days to weeks after allogenic bone marrow transplantation.Reference;Robbins and Cotran pathologic basis of disease South Asia edition.', 'role': 'assistant'}]