<prompt> A chest physician performs bronchoscopy in the procedure room of the out patient depament. To make the instrument safe for use in the next patient waiting outside, the most appropriate method to disinfect the endoscope is by:70 alcohol for 5 min2 glutaraldelyde for 20 min2 formaldehyde for 10 min1 sodium hypochlorite for 15 min  <response>: For sterlizing all scopes - we use 2 glutaraldehyde cidex Except Stethoscope - for which we use - Iso propyl Alcohol Formaldehyde Liquid formalin 