Among the options provided, the best examples of infrastructure are:
institutions, administration, and education.
Infrastructure generally refers to the fundamental physical and organizational structures and facilities needed for the operation of a society or enterprise, which includes institutions and systems that support various sectors.
The other options, such as oil refinement and health care, pertain to industries or sectors rather than infrastructure itself, while coffee, cotton, and tea crops are agricultural products, not examples of infrastructure. Local and national politicians are part of the governance system but do not represent infrastructure.