The only real predictable thing about a drug and how an individual will respond to a drug is
a. that it is not predictable
b. available through the pharmacist
c. written in medical journals
d. known by the individual's doctor

The correct answer is A.

It can never be predicted how an individual will respond to a drug, any drug, legal or illegal. We all react differently because we are all different in our biological and social makeup due to internal and external factors. How one person reacts can be completely different to another person. It should never be taken for granted that a drug will have the same effect on everyone.

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answer; i believe that the correct answer is (participation);