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 directly affects the prognosis of an avulsed tooth: \nSelect and explain. \nA. Length of time the tooth was out of the mouth, B. Condition of the dental socket when the tooth was replanted, C. Whether necrotic cementum was removed from the root, D. Whether the pulp was extirpated to prevent Periapical inflammation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]