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The term "PA" commonly refers to "Physician Assistant." A Physician Assistant is a healthcare professional who practices medicine under the supervision of a physician. They are trained to perform a range of medical duties, including diagnosing illnesses, developing treatment plans, and prescribing medications. This role is integral in expanding access to healthcare services, as PAs often work in various medical settings, such as hospitals, clinics, and private practices, contributing to patient care and management.

The other options represent roles or titles that can exist within different contexts but do not align with the standard medical abbreviation "PA." For instance, while a Patient Assistant may support patients in navigating healthcare services, it lacks the formal medical training associated with a Physician Assistant. Similarly, a Psychiatric Assistant works in mental health settings but does not have the same scope of practice. Lastly, a Public Aide typically refers to a role focused on community services or support, which is distinct from clinical responsibilities. Hence, "Physician Assistant" is the most accurate and commonly recognized definition of "PA" within the healthcare industry.