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Which of the following is a controllable risk factor of infectious diseases?
A.
drug abuse
B.
pollution
C.
air
D.
heredity

Respuesta :

Break down the sentence.
Which of the following is a controllable risk factor of infectious diseases?
note - "controllable"
You cannot control pollution, air, or heredity. You can, however, control your substance intake. 
The answer is A, drug abuse.
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