Infrastructure typically refers to the fundamental facilities and systems serving a country, city, or area, including the services and facilities necessary for its economy to function. This includes transportation systems, utilities, and services, such as communications, water supply, sewage, and others.
Among the options provided, "oil refinement and health care" aligns most closely with the concept of infrastructure, as these involve essential systems and services that support the economy and public well-being.
Therefore, the best response is:
oil refinement and health care