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': 'Preformed antibodies cause - \nSelect and explain. \nA. Hyperacute rejection, B. Acute rejection, C. Chronic rejection, D. Acute humoral rejection', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Harshmohan textbook of pathology 7th edition . *hyper acute rejection appeares with in minutes to hours of placing the transplant and destroy it.It is mediated by preformed humoral antibody against donar antigen', 'role': 'assistant'}]