This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Microbiology
Best chemical disinfectant to disinfect stethoscope: 
Select and explain. 
A. Isopropyl alcohol, B. Ethylene oxide, C. Halogenated compound, D. Plasma sterilization
A: Isopropyl alcohol
Answer: A: Isopropyl alcohol 
Explanation: 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.