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
Hyperacute rejection is due to - 
Select and explain. 
A. Preformed antibodies, B. Cytotoxic T-lymphocyte medicated injury, C. Circulating macrophage mediated injury, D. Endothelitis caused by donor antibodies
A: Preformed antibodies
Answer: A: Preformed antibodies 
Explanation: Ans. is 'a' i.e., Preformed antibodies