Which container is identified as holding freeze-dried sterile powder for reconstitution?

The correct answer identifies a vial as the appropriate container for holding freeze-dried sterile powder intended for reconstitution. Vials are designed for the storage of pharmaceutical preparations, and they provide a sterile environment essential for maintaining the integrity of the medication.

When dealing with freeze-dried powders, which may need reconstitution with a diluent before administration, vials typically come equipped with a rubber stopper. This allows for the safe access of a syringe while minimizing contamination risks. The ability to seal tightly also ensures that the contents remain sterile until use, which is crucial for patient safety and the efficacy of the medication.

Other choices like ampules are generally used for single-dose liquid medications and do not accommodate powders for reconstitution effectively. Multi-dose vials, while they can contain liquids or solutions, are not specifically used for freeze-dried powders. Filters do not hold substances and are instead used to ensure sterile preparation by removing particulates and bacteria from a solution. Thus, the vial provides the most suitable storage solution for freeze-dried sterile powders.