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
Main disadvantage of glass bead sterilizer: 
Select and explain. 
A. Technique sensitive, B. Only glass instruments can be sterilized, C. Only small instruments can be sterilized, D. None of the above
C: Only small instruments can be sterilized
Answer: C: Only small instruments can be sterilized 
Explanation: The hottest part of glass bead sterilizer is along its outer rim and the temperature is lowest in the centre of surface layer of salt. 
To sterilize an instrument properly, one should immerse at least a  “quarter-inch" below the salt surface and in peripheral area of the sterilizer. 
The main disadvantage of glass bead sterilizer is that only small instruments can be sterilized.  
Temp ⇒ 425°F - 475F°F  for 5 sec.