In the Early 19th Century,the Russian Government Sent Doctors to Southern

Multiple Choice

In the early 19th century,the Russian government sent doctors to southern Russian villages to provide assistance during a cholera epidemic.The villagers noticed that wherever doctors appeared,people died.Therefore,many doctors were chased away from villages,and some were even killed.This reaction to the correlation between doctors and deaths is most likely a problem of

A) omitted variables.
B) reverse causality.
C) government propaganda.
D) medical incompetence.