The nurse explains to a client that the drug administration of a medication is to be placed between the gum and jaw. By which route is the nurse administering this medication?

Choice A reason: Topical applies to skin or mucous surfaces broadly; gum/jaw placement is specific to buccal, not the general external or mucosal topical category. Choice B reason: Oral means swallowed; buccal drugs stay in the mouth for absorption, avoiding the digestive tract, making this an incorrect route classification. Choice C reason: Buccal involves placement between gum and cheek; it allows direct mucosal absorption into the bloodstream, bypassing first-pass metabolism effectively. Choice D reason: Sublingual is under the tongue; gum/jaw specifies buccal, as sublingual targets a different oral site with distinct absorption dynamics.