Final answer:
The National Board for Certification in Occupational Therapy (NBCOT) is the entity that administers the national certification examination for entry-level occupational therapy practitioners.
Step-by-step explanation:
The organization responsible for assessing the entry-level competency of an occupational therapy practitioner through an examination process is the National Board for Certification in Occupational Therapy (NBCOT). This organization administers a national certification examination which candidates must pass to become eligible to practice as an occupational therapist or an occupational therapy assistant. Neither the American Medical Association (AMA), the Occupational Therapy Regulatory Board, nor the American Occupational Therapy Association (AOTA) is responsible for this certification exam. The AOTA focuses on professional standards and advocacy for occupational therapy, but it does not assess entry-level competency via an exam.