Which of the following types of containers prevents air from reaching the medication?

Unit dose
Multidose
Single dose
Hermetic

Hermetic

Rationale: A hermetic container is impervious to air and gas. A unit-dose container is a single-unit container intended for administration other than parenteral. A multidose container is used for parenteral administration. A single dose container is only used once, and is not impervious to air or gas.