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': 'Rule of Nine estimates : \nSelect and explain. \nA. The extent of the burn., B. Degree of severity., C. Degree of infection., D. The extent of mortality.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]