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
In dental practice, how should mercury be discarded after amalgam restoration: 
Select and explain. 
A. Collect carefully and recycle, B. Chemical treatment, C. Deep burial, D. Incineration
A: Collect carefully and recycle
Answer: A: Collect carefully and recycle 
Explanation: None