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The abbreviation DO stands for Doctor of Osteopathic Medicine. This designation indicates a licensed physician who has completed a specific training program focused on a holistic approach to healthcare. These physicians are qualified to practice medicine, perform surgeries, and prescribe medications, just like their MD (Doctor of Medicine) counterparts.

What sets DOs apart is their emphasis on the musculoskeletal system and a philosophy that considers the whole person rather than just the symptoms of a disease. They receive additional training in osteopathic manipulative treatment (OMT), which involves hands-on techniques to help diagnose and treat conditions. This approach is rooted in the belief that the body's structure and function are interconnected, allowing DOs to provide comprehensive care.

The other options refer to medical professions that are not represented by the abbreviation DO. While all are valid medical designations, they do not align with the focus and training associated with osteopathic medicine.