Which body is primarily responsible for enforcing HIPAA regulations?

The Office for Civil Rights (OCR) is primarily responsible for enforcing the Health Insurance Portability and Accountability Act (HIPAA) regulations. OCR's role includes ensuring that covered entities and their business associates comply with the privacy and security provisions set forth in HIPAA. This office investigates complaints, conducts compliance reviews, and provides education and guidance regarding HIPAA regulations.

The other options, while important entities in the realm of health and safety, do not have enforcement authority over HIPAA. The Department of Labor is focused on workplace conditions and labor standards. The Food and Drug Administration primarily regulates food safety, pharmaceuticals, and medical devices without direct enforcement over health information privacy. The National Institute of Health mostly focuses on medical research and does not oversee HIPAA compliance. Therefore, the OCR's specific mandate regarding privacy rights within health care makes it the correct answer for enforcing HIPAA regulations.