Which health agency is responsible for ensuring access to basic public health services in the Philippines?

The Department of Health (DOH) in the Philippines is the primary agency responsible for ensuring access to basic public health services. It oversees the implementation of health programs and policies aimed at protecting and promoting public health across the country. The DOH's roles include coordinating health services, managing public health initiatives, and responding to health emergencies, thereby ensuring that the population has access to essential medical care and health education.

This agency’s efforts are crucial in managing public health crises, monitoring disease outbreaks, and providing immunization programs, among other responsibilities. The DOH is tasked with formulating and executing health policies and plans, making it the cornerstone of health service delivery in the Philippines. The other options do not have the same level of direct responsibility for public health services within the country.