Which type of health professional could diagnose and treat medical conditions under a physician's oversight?

The correct choice is the Physician Assistant. A Physician Assistant (PA) is a licensed medical professional who is trained to diagnose and treat medical conditions, often under the supervision of a physician. This means that while they can perform many duties similar to those of a doctor, their practice is typically guided by a physician who oversees their work. This collaborative model allows PAs to provide high-quality care in a variety of healthcare settings, including hospitals, clinics, and other medical facilities.

In addition to diagnosing and treating illnesses, PAs can perform physical exams, order and interpret tests, and provide patient education. Their training involves both medical school coursework and clinical practice, equipping them with a comprehensive understanding of patient care.

The role of a Physician Assistant is distinct from that of other health professionals listed. For example, nurses, while also vital to patient care, have different scopes of practice and responsibilities, focusing more on nursing care rather than direct diagnosis and treatment. Occupational Therapists concentrate on helping patients improve their daily living and working skills after injury or illness but do not diagnose or treat medical conditions. Pharmacists primarily deal with medications, ensuring safe and effective use, but their function does not include diagnosing or managing medical conditions in the same way as PAs.