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': 'How early can gutta percha be removed after root canal obturation to prepare post space \nSelect and explain. \nA. Immediately, B. 24 hours, C. 48 hours, D. Can be removed after one week', 'role': 'user'}, {'content': 'Answer: A \nExplanation: No difference in apical seal is observed when Gp is removed immediately or after a week from the root canal.', 'role': 'assistant'}]