Co-insurance is:
select one:
a. a set amount the subscriber pays for each medical service.
b. a percentage the subscriber is required to pay of every medical bill.
c. the amount the subscriber must pay before the insurance begins to pay.
d. none of the above.

Americans often speak of their country as one of several large regions.  these regions are cultural units rather than governmental units --  formed by history and geography and shaped by the economics, literature and folkways that all the parts of a region share. what makes one region different from another? a region's multicultural heritage as well as distinct demographic characteristics like age and occupation make regions different and special. within several regions, language is used differently and there are strong dialects. there are also differences in outlook and attitude based on geography.