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: Social & Preventive Medicine
Mercury is disposed by 
Select and explain. 
A. Controlled combustion, B. Deep burial, C. Chemical treatment, D. Safely collect and re-use
D: Safely collect and re-use
Answer: D: Safely collect and re-use 
Explanation: None