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
[{'content': 'Hyperacute graft rejection is \nSelect and explain. \nA. Type I hypersensitivity, B. Type II hypersensitivity, C. Type III hypersensitivity, D. Type Iv hypersensitivity', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In this case preformed circulating antibody binds to graft endothelial HLA and also activates complement system.\nHence, this is Type II HS.', 'role': 'assistant'}]