Final answer:
An individual with a pattern of drug abuse and a strong desire to use has developed an addiction. Addiction entails a compulsive need to use drugs despite harmful consequences, and is often accompanied by tolerance and dependence, both physical and psychological.
Step-by-step explanation:
When an individual develops a behavioral pattern of drug abuse and an overwhelming desire to get and use the drug, we say that the individual has developed an addiction. Addiction is characterized by the compulsive use of a substance, such as a psychoactive drug, despite the negative consequences of such use. This compulsive behavior often leads to the user's inability to stop using the drug, defining a state of drug dependence.
Physical dependence is indicated by withdrawal symptoms upon cessation of drug use and is distinct from psychological dependence, which involves a persistent craving for the drug. Tolerance, which occurs when a user requires increasing amounts of the drug to achieve the same effects, is often part of physiological dependence and can dangerously lead to overdose. Drug addiction, tolerance, and dependence highlight the severity of substance use disorders that require rehabilitation efforts to overcome.
Furthermore, the term 'tolerance' refers to the need for an individual to consume more of a given drug to experience the same effects previously achieved with lesser amounts, which can be a sign of physiological dependence. The correct choice from the provided options for the condition described in the question would therefore be 'b. psychological dependence'.