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
Cystoscopes and bronchoscopes are sterilized by 
Select and explain. 
A. Orthophthaldehyde, B. Glutaraldehyde, C. Formaldehyde, D. Isopropylalchol
A: Orthophthaldehyde
Answer: A: Orthophthaldehyde 
Explanation: Both orthophthaldehyde and Glutaraldehyde are used
But Orthophthaldehyde > Glutaraldehyde.