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: Surgery
[{'content': 'Hyperacute rejection of transplant is due to \nSelect and explain. \nA. T cell mediated, B. B cell mediated, C. Preformed antibodies, D. Macrophage mediated injury', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Preformed antibodies will cause hyperacute rejection.\nT cells will cause acute rejection.', 'role': 'assistant'}]