<prompt> Best chemical disinfectant to disinfect stethoscope:Isopropyl alcoholEthylene oxideHalogenated compoundPlasma sterilization  <response>: Ans. A. Isopropyl alcoholMedical devices require disinfection as per Spaulding criteria of criticality according to degree of risk for infection involved in use of these items. Stethoscope is a non-critical device requiring intermediate-low level disinfectant. Isopropyl alcohol can be routinely used for disinfection of stethoscope. 