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': 'Allograft rejection is an example of which type of hypersensitivity reaction - \nSelect and explain. \nA. Immediate hypersensitivity, B. Delayed hypersensitivity, C. Swazmans reaction, D. GVHD', 'role': 'user'}, {'content': 'Answer: B \nExplanation: . Delayed hypersensitivity', 'role': 'assistant'}]