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: Dental
[{'content': 'Which of the following grafts has the best prognosis? (OR) Which of the following graft has high success rate? \nSelect and explain. \nA. Xenograft, B. Autograft, C. Allograft, D. Homograft', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]