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
Proctoscope is sterilised by: 
Select and explain. 
A. Autoclave, B. Glutaraldehyde, C. Formalin, D. Soap
B: Glutaraldehyde
Answer: B: Glutaraldehyde 
Explanation: Glutaraldehyde