When a disease is endemic to a country or region, it __________.
a. frequently infects the population
b. very rarely infects the population
c. only infects adults in the population
d. only infects children in the population

When a disease is endemic to a country or region, it  frequently infects the population. Correct answer: A

Endemic disease denotes a disease that is found in a certain geographic region  and is constant present and/or there is a usual prevalence of a disease or infectious agent in a population within a geographic area. Example: Malaria is endemic disease because is restricted to a place (Afrca).