The science of epidemiology has passed through three eras and is entering a fourth. In what order did it pass through the first three eras?

The science of epidemiology has passed through three eras and is entering a fourth. In what order did it pass through the first three eras?
A) Sanitary, Infectious, Chronic.
B) Sanitary, Chronic, Infectious.
C) Chronic, Sanitary, Infectious.
D) Chronic, Infectious, Sanitary.
E) Infectious, Sanitary, Chronic.


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