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': 'The relationship between the working edge of the instrument and the tooth surface is: \nSelect and explain. \nA. Angulation, B. Access, C. Adaptation, D. Activation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]