A group of nurses are discussing the difference of an agonist verses an antagonist. Which of the following medications may the nurse select as an agonist?

A. Medications that limit the receptor activity: This describes an antagonist, which reduces or limits receptor activity. B. Medications that block the receptor activity: This also describes an antagonist, which prevents receptor activation. C. Medications that change the receptor activity: This statement is vague and does not clearly define an agonist. D. Medications that activate the receptor activity and are synergistic: An agonist binds to a receptor and stimulates a response, often enhancing normal physiological functions.