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 laser used on a crown for debonding orthodontic bracket is known as \nSelect and explain. \nA. Thermal softening, B. Thermal ablation, C. Photoablation, D. Laser debonding', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]