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': 'Highest chance of success in renal transplant is possible when the donor is: September 2007, 2010 \nSelect and explain. \nA. Father, B. Mother, C. Twin, D. Son', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. C: Twin Isograft is a subset of allografts in which organs or tissues are transplanted from a donor to a genetically identical recipient (such as an identical twin). Isografts are differentiated from other types of transplants because while they are anatomically identical to allografts, they don't trigger an immune response.", 'role': 'assistant'}]