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The oldest and still most dependable method of sterilization in general use is

  • A.ultraviolet irradiation
  • B.quaternary ammonium disinfection
  • C.membrane filtration
  • D.saturated steam under pressure

Answer: D

Steam under pressure is rapid, reliable, non-toxic, inexpensive and sporicidal, and it penetrates fabrics and porous loads well, which is why it remains the default wherever the item can tolerate heat and moisture. The alternatives exist mainly for items that cannot.

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