This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
[{'content': 'Hyperacute rejection is due to \nSelect and explain. \nA. Preformed antibodies, B. Cytotoxic T lymphocyte mediated injury, C. Endothelitis caused by donor antibodies, D. Circulating macrophage mediated injury', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hyperacute rejection occurs when preformed anti-donor antibodies are present in the circulation of the recipient. Such antibodies may be present in a recipient who has previously rejected kidney transplant, Multiparous women, Prior blood transfusionsHyperacute Rejection occurs within minutes or hours after transplantation.Robbins pathology 9e Pg: 233', 'role': 'assistant'}]