This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Microbiology
Which is used for sterilization of cystoscope 
Select and explain. 
A. Glutaraldehyde, B. Formaldehyde, C. Isopropyl alcohol, D. Ethylene oxide
A: Glutaraldehyde
Answer: A: Glutaraldehyde 
Explanation: Ans. (a) Glutaraldehyde