Final answer:
The true statement about controlled substances is that all classified controlled substances have the potential for physical or psychological dependency. Controlled substances are categorized into five schedules by the Controlled Substances Act, and psychoactive drugs can be legal, prescribed, or illegal, affecting the brain and behavior in various ways.
Step-by-step explanation:
The true statement about controlled substances among the options provided is B) All drugs classified as controlled substances have the potential for physical or psychological dependency. This encompasses a wide range of drugs, not all of which are narcotics, as drugs can be classified based on their abuse and dependency potential under the Controlled Substances Act, which is enforced by the Drug Enforcement Administration (DEA) in conjunction with the Food and Drug Administration (FDA). The Controlled Substances Act categorizes these substances into five schedules based on their potential for abuse, medical use, and safety or dependence liability, not six categories.
Psychoactive drugs are substances that can affect the brain, leading to changes in mood, perception, and behavior. They include legal substances like alcohol and nicotine, prescribed medications like opioid painkillers, and illegal drugs such as LSD and heroin. The classes of psychoactive drugs outlined include stimulants, depressants, anxiolytics (such as benzodiazepines that activate GABA receptors and have a general depressant effect), euphoriants, hallucinogens, and empathogens, with many drugs falling into more than one class due to their multiple effects.