1. They are powerful painkillers. They produce a quick, intense feeling of pleasure followed by a sense of well-being and calm feeling."
A. hallucinogens
B. opiates
C. depressants
D. stimulants

B

Explanation:

These are mostly used to treat pain, and are highly addictive if abused. Opioids temporarily reduce pain and anxiety. They create a sense of numbness in the body and mind. High doses can create a short-lived feeling of euphoria and drowsiness, but lead to a habit that can develop in addiction.