a) Filtration
b) Chemical method of sterilization
c) Steam Sterilization
d) Chlorine dioxide gas
Answer: a
Explanation: Filtration is the fastest way to sterilize solutions without heating. In this method the filters with a pore diameter of 0.2 um are used for the removal of bacteria. But they cannot be used to remove fungi and virus as they are in smaller size compared to bacteria.
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