This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Transplantation, Subject name: Surgery
[{'content': 'Transplantation of which one of the following organs is most often associated with hyper acute rejection? \nSelect and explain. \nA. Heart, B. Kidney, C. Lungs, D. Liver', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) KidneyRef: Bailey 26th edition, Page 1409* Hyperacute rejection is most common in Kidney* Hyperacute rejection is very rare in liver', 'role': 'assistant'}]