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
Hyperacute rejection of transplant is due to 
Select and explain. 
A. T cell mediated, B. B cell mediated, C. Preformed antibodies, D. Macrophage mediated injury
C: Preformed antibodies
Answer: C: Preformed antibodies 
Explanation: Preformed antibodies will cause hyperacute rejection.
T cells will cause acute rejection.