A state in which someone relies on a drug to achieve normal physiological functioning is known as

A) drug misuse.
B) drug dependence.
C) drug tolerance.
D) drug addiction.

Drug dependence is characterized by physical or psychological dependence on a drug to achieve normal physiological functioning. Drug misuse refers to the inappropriate use of a drug, while drug tolerance refers to the need for increasing doses of a drug to achieve the same effect. Drug addiction is a complex behavioral disorder characterized by compulsive drug seeking and use despite harmful consequences.