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
Endoscope tube is sterilized by? 
Select and explain. 
A. Glutaraldehyde, B. Formalin, C. Autoclaving, D. Boiling
A: Glutaraldehyde
Answer: A: Glutaraldehyde 
Explanation: Ans. is 'a' i.e., Glutaraldehyde 2% Glutaraldehyde (cidex) is most often used for equipment such as endoscope that cannot be sterilized or disinfected by heat.