<prompt> Heat-labile instruments for use in surgical procedures can be best sterilized by -Absolute alcoholUltraviolet raysChlorine releasing compoundsEthylene oxide gas  <response>: Ethylene oxide used mainly by industry for the sterilization of plastic and other thermolabile material that cannot withstand heating - Greenwood 16th ep. 74.Other methods for sterilization of heat labile instruments- Ionizing radiation- Formaldehyde in combination with subatmospheric steam. 