What is the correct term for the route "rectally"?

The term "PR" stands for "per rectum," which is the method of administration indicating that medication is given via the rectal route. This designation is commonly used in clinical settings to specify that a drug should be delivered directly into the rectum, allowing for absorption through the rectal mucosa. This route is often chosen for patients who may not be able to take medications orally due to vomiting, difficulty swallowing, or other gastrointestinal issues.

In contrast, the other terms relate to different routes of administration: "TD" typically refers to transdermal, which involves delivery through the skin; "INH" indicates inhalation, used for respiratory medications administered via inhalers or nebulizers; and "top" refers to topical, which is applied directly to the surface of the skin. Thus, the choice "B" is indeed the correct term for rectal administration.