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
Paper points are sterilized by: 
Select and explain. 
A. Cold sterilization with chemical solution, B. Boiling, C. Hot salt sterilizer, D. All of the above
C: Hot salt sterilizer
Answer: C: Hot salt sterilizer 
Explanation: None