Progesterone capsule counting tray must be cleaned because:

High-alert medications are drugs that have a heightened risk of causing significant harm when used in error. While progesterone may be considered a high-alert medication in certain contexts, the primary reason for cleaning the counting tray relates to its classification as a hazardous drug rather than its alert status.

Antibiotics are medications specifically used to treat bacterial infections. Progesterone is a hormone used for various therapeutic purposes, including hormone replacement therapy and menstrual cycle regulation, but it is not classified as an antibiotic. Thus, this option does not pertain to the need for cleaning the tray.

Therapeutic equivalence refers to different drugs that have the same clinical effect and safety profile when administered to patients. This concept is unrelated to the necessity of cleaning the counting tray, which is dictated by the hazardous nature of the drug rather than its equivalency to other medications.