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The specialist who focuses on physical medicine and rehabilitation is known as a physiatrist. Physiatrists are medical doctors who have expertise in diagnosing and treating conditions that affect movement and physical functioning. Their training includes understanding the complex interactions between physical, emotional, and social aspects of health, allowing them to create comprehensive rehabilitation plans. They work with patients recovering from injuries, surgeries, chronic pain, or disabilities to improve their quality of life through various therapies and interventions.

In contrast, a proctologist specializes in disorders of the rectum and anus, focusing on conditions like hemorrhoids or anal fissures. A pediatrician is a medical professional who treats infants, children, and adolescents across a wide range of health issues. A radiologist, on the other hand, is primarily involved in diagnosing and interpreting medical images, such as X-rays and MRIs, and does not directly engage in rehabilitation or physical therapy interventions. Therefore, among the choices listed, the physiatrist is the only one whose expertise aligns with physical medicine and rehabilitation.