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 graft rejection is 
Select and explain. 
A. Type I hypersensitivity, B. Type II hypersensitivity, C. Type III hypersensitivity, D. Type Iv hypersensitivity
B: Type II hypersensitivity
Answer: B: Type II hypersensitivity 
Explanation: In this case preformed circulating antibody binds to graft endothelial HLA and also activates complement system.
Hence, this is Type II HS.