Final answer:
The principle of veracity is what guides physical therapists to provide honest information to their patients, ensuring truthful communication.
Step-by-step explanation:
The bioethical principle that addresses a physical therapist's duty to provide honest information to his or her patients is veracity. This principle is concerned with truth-telling and requires that healthcare professionals communicate honestly with their patients, giving them all the necessary information to make informed decisions about their care. This reflects respect for the patient's autonomy and aligns with ethical practices in healthcare.