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: Unknown
Allograft rejection is an example of which type of hypersensitivity reaction? 
Select and explain. 
A. Immediate hypersensitivity, B. Delayed hypersensitivity, C. Swartzmans reaction, D. GVHD
B: Delayed hypersensitivity
Answer: B: Delayed hypersensitivity 
Explanation: None