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': "In Ingle's method of Endodontic working length determination, safety allowance is for \nSelect and explain. \nA. Possible image distortion or magnification, B. To confirm with apical termination, C. Periapical bone resorption, D. Recording final working length", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]