We deal with toxic substances every day. All of the following are methods used to limit risk from exposure to toxic substances EXCEPT
A. establishing a level (threshold level) below which exposed test animals show no reaction.
B. setting limits to the amount of exposure a person is allowed to receive in the workplace.
C. subjecting test animals to a substance to see if they become ill or die.
D. prohibiting the use of toxic substances by the public.
Answer: D
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