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: Microbiology
[{'content': 'Type of graft, best suited for renal transplantation - \nSelect and explain. \nA. Allograft, B. Autograft, C. Xenograft, D. Isograft', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Although the best graft is-autograft, a renal graft can obviously not be an autograft.\nSo the best renal graft is an isograft.', 'role': 'assistant'}]