This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
[{'content': 'Fiber optic instruments like endoscopes should be disinfected by \nSelect and explain. \nA. Formaldehyde, B. Cetrimide, C. Gamma radiation, D. Glutaraldehyde', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 2% Glutaraldehyde for 20 minutes is active against bacteria, viruses and fungi. Latest 0.5% Ohophthaldehyde is used with 5min Contact period. Ref : Ananthanarayana textbook of Microbiology 9th edition Pgno : 33', 'role': 'assistant'}]