This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Microbiology Pa-2 and Pa-3 (Sterilization and Bacterial Genetics), Subject name: Microbiology
Out of the following the true statement regarding sterilization is - 
Select and explain. 
A. Dry heat is the best method of sterilization of liquid paraffin, B. All glass wares are best sterilized by boiling at 100o C, C. Bacterial vaccines are best sterilized by ethylene oxide, D. Pasteurization of milk by flash method is done by heating at 63degree C for 30 minutes.
A: Dry heat is the best method of sterilization of liquid paraffin
Answer: A: Dry heat is the best method of sterilization of liquid paraffin 
Explanation: Option 1 Liquid paraffin is sterilized by Hot air oven (dry heat). Option 2 Glass ware like test tube, pipette, flask and glass syringes. Fixed oil glycerin, liquid paraffin, propylene glycol and zinc oxide etc. sterilized by Hot air oven (dry heat). Option 3 Filtration (Membrane filters) is an excellent way to remove the microbial population in solutions of heat-labile materials like vaccine, antibiotics, toxin, serum and sugar solution as well as for purification of air in laminar air flow systems. Option 4 Pasteurization is an example of sterilization at a temperature <100degC. Methods: 63degC for 30 min (Holder method) and 72degC for 15-20 sec (Flash method) followed by rapid cooling to 13degC