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: Surgery
What is the fastest, safest and most effective to sterilize a metal impression tray with a solder that melts at a temperature above 175°C? 
Select and explain. 
A. Filtration, B. Autoclaving, C. Dry heat sterilization, D. Soakig in 2% glutaraldehyde
B: Autoclaving
Answer: B: Autoclaving 
Explanation: None