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: Surgery
[{'content': 'Trasplantation of which one of the following organs is most often associated with hyper-acute rejection?? \nSelect and explain. \nA. Hea, B. Kidney, C. Lungs, D. Liver', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Kidney", 'role': 'assistant'}]