Which term most accurately describes the following definition? "The occurrence in a community or region of cases of an illness,specific health-related behavior,or other health-related events clearly in excess of normal expectancy." [Porta M,ed.A Dictionary of Epidemiology.New York: Oxford University Press; 2014.]

A) Endemic
B) Epidemic
C) Pandemic
D) Attack rate
E) Incubation period

An epidemic is the occurrence of health-related events in a community or region,in clear excess of normal expectation.Endemic is not true because it is defined as the constant occurrence of a disease,disorder,or noxious infectious agent in a geographic area or population group.Pandemic is not true because it is defined as an epidemic occurring over a very wide area,crossing international boundaries,and usually affecting a large number of people.Attack rate is not true because it is defined as number of people at risk in whom a certain illness develops over total number of people at risk.Incubation period is not true because it is the interval from receipt of infection to the time of onset of clinical illness (the onset of recognizable symptoms).