Which of the following is a water-soluble vitamin?

A. Wrapping hinged instruments in the open, unlocked position: Hinged instruments should be wrapped in the open, unlocked position to ensure that steam can penetrate all surfaces for effective sterilization.
B. Allowing the temperature of the autoclave to reach 200° F before timing: The autoclave should reach the required temperature (typically 250°F or 121°C) for the appropriate amount of time for sterilization, not 200°F.
C. Using a ballpoint pen to label contents: It is not advisable to use a ballpoint pen for labeling sterilized items because ink might not withstand the autoclave's high temperatures. Permanent markers or labels that can endure high temperatures should be used.
D. Stacking wrapped packages tightly into the autoclave: Items should be arranged in a way that allows steam to circulate freely, so tightly stacking packages can hinder proper sterilization.

A. Lysosomes: Lysosomes contain digestive enzymes that break down waste materials and cellular debris but are not responsible for energy production.
B. Mitochondria: Mitochondria are known as the "powerhouses" of the cell because they produce energy through cellular respiration.
C. Nucleolus: The nucleolus is involved in producing ribosomes and RNA synthesis, not energy production.
D. Microvilli: Microvilli increase the surface area of cells for absorption but do not produce energy.