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 dental practice, how should mercury be discarded after amalgam restoration: \nSelect and explain. \nA. Collect carefully and recycle, B. Chemical treatment, C. Deep burial, D. Incineration', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]