Final answer:
Heroin is the drug classified as an opiate among the provided options. It is derived from morphine, comes from the opium poppy, and is known for its analgesic effects and high potential for abuse.
Step-by-step explanation:
Responding to a situation at a center involving a teenager who has injected an opiate, it's important to understand which substances fall under this category of drugs. Among the options provided, heroin is classified as an opiate. Heroin is derived from morphine, which in turn comes from the opium poppy plant. Opiates like heroin are known for their strong analgesic (pain-relieving) properties and high potential for abuse, leading to physical dependence and a risk of severe withdrawal symptoms. In medical treatment, a person with a heroin addiction may be prescribed methadone, a psychoactive drug that reduces cravings and withdrawal symptoms without creating addiction itself. It's important for the teenager who injected heroin to receive immediate medical attention and to consider long-term treatment options for recovery from opiate addiction.