Among the options provided, "oil refinement and health care" are the best examples of infrastructure. Infrastructure typically refers to the fundamental facilities and systems serving a country, city, or area, including the services and facilities essential for its economy to function. This includes industries such as oil refinement, which is crucial for energy supply, and health care, which is essential for public health and welfare.
The other options do not fit the typical definition of infrastructure as they relate more to social structures or products rather than facilities or systems.
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