Which of the following are examples of infrastructure?

Institutions, administrations and education
Coffee, cotton and tea crops
Oil refinement and health care
Local and national politicians

The following are examples of infrastructure:

- Oil refinement: This refers to the facilities and processes involved in refining crude oil into usable petroleum products such as gasoline, diesel, and jet fuel.
- Health care: This refers to the facilities and services involved in the provision of medical care, including hospitals, clinics, doctors' offices, and medical equipment.
- Local and national politicians: While politicians play a crucial role in governance, they are not considered examples of infrastructure. Infrastructure typically refers to the physical structures and systems that support a society, such as roads, bridges, transportation networks, water and sewage systems, and communication networks.