This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and Health, Subject name: Social & Preventive Medicine
Autoclaving is not useful for disposal of: 
Select and explain. 
A. Surgical dressings, B. Metallic instruments, C. Petri dishes, D. Liquid paraffin
D: Liquid paraffin
Answer: D: Liquid paraffin 
Explanation: Ans. (d) Liquid paraffinRef : K. Park 23rd ed. /128* Autoclaving is a method of disinfection mainly used for surgical dressings, instruments, laboratory wares, media and pharmaceutical products.* Principle: Steam + High pressure (~ 30 psi) and temperature 121 C.* Efficiency test of autoclaving: spores of Bacillus Stearothermophillus.