<prompt> Fiber optic instruments like endoscopes should be disinfected byFormaldehydeCetrimideGamma radiationGlutaraldehyde  <response>: 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 