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
Endoscopy tube sterilized by ? 
Select and explain. 
A. 2 % glutaraldehyde, B. Na hypochlorite, C. Ethylene dioxide, D. Ionizing radiation
A: 2 % glutaraldehyde
Answer: A: 2 % glutaraldehyde 
Explanation: Ans. is 'a' i.e., 2 % glutaraldehyde