Final answer:
A nurse telling a patient about the benefits of the flu shot despite some discomfort exemplifies the ethical principle of beneficence because it aims to benefit the patient's health.
Step-by-step explanation:
The best example of a nurse demonstrating beneficence is when a nurse tells the patient that the flu shot may cause some discomfort but describes the benefits of the immunization. This action directly aligns with the principle of beneficence, which focuses on acting in ways that benefit others and contribute to their well-being.
The nurse acknowledges the discomfort, which is a minor harm, but ensures that the overall action is beneficial by explaining the health benefits of the flu shot, thus fulfilling the role of promoting the patient's good health.