What is the epidemiology of parasitic disease? （）

A.It is a science that studies the patterns on occurrence, transmission, prevalence and outcome of parasitic diseases in animal populations.

B.It is a science that studies the patterns on occurrence, transmission, prevalence and outcome of parasitic diseases in most animal populations.

C.It is a science that studies the patterns on occurrence, transmission, prevalence and outcome of parasitic diseases in a certain kind of animal populations.

D.It is a science that studies the routes on occurrence, transmission, prevalence and outcome of parasitic diseases in some animal populations.

正确答案：It is a science that studies the patterns on occurrence, transmission, prevalence and outcome of parasitic diseases in animal populations.