What is the definition of 'sedative'?

The term 'sedative' refers specifically to a calming drug or agent that is used to soothe agitation or anxiety, induce sleep, or relieve tension. Sedatives work by depressing the central nervous system, leading to a state of relaxation and calmness.

In contrast, while the other choices involve different medicinal purposes, they do not align with the core definition of sedative. For instance, a drug that energizes aims to stimulate activity rather than calm it. Medications for pain relief address discomfort but may not necessarily produce calming effects, and treatments for anxiety could fall under sedatives but also encompass a broader array of therapies and medications that do not specifically function as sedatives. Thus, the accurate interpretation of 'sedative' is best captured by defining it as a calming drug or agent.