Which are the two primary categories of narcotics?

The correct answer is that the two primary categories of narcotics are opiates and synthetics. Opiates are naturally derived from the opium poppy and include substances like morphine and codeine, which are traditionally used for pain relief. Synthetics, on the other hand, refer to man-made drugs designed to mimic the effects of opiates, such as fentanyl and methadone. Both categories function primarily as pain relievers and have the potential for misuse and addiction.

The other choices involve different types of drugs that do not fall under the classification of narcotics. Barbiturates and alcohols are central nervous system depressants but are not categorized as narcotics. Cannabinoids and hallucinogens refer to substances that affect mood and perception rather than pain relief, while inhalants and stimulants encompass a different spectrum of drug classifications primarily focused on enhancing energy or producing psychoactive effects.