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: Microbiology
Endoscopes are strelized by: 
Select and explain. 
A. Glutaraldehyde, B. Autoclave, C. Formaldehyde, D. Hot air oven
A: Glutaraldehyde
Answer: A: Glutaraldehyde 
Explanation: Glutaraldehyde