Select the correct statements from the following.

(i) Cocaine decreases the activity of the central nervous system.

(ii) Opioid drugs typically produce a sense of euphoria and increased energy.

(iii) Morphine is used for the treatment of severe pain associated with surgery.

(iv) Datura contains drugs that cause hallucinations.

Morphine is a powerful opioid analgesic. It blocks the transmission of pain signals and hence is used for the treatment of severe pain associated with conditions such as cancer, surgery, injury, or chronic pain conditions.
Datura plant contains several toxic alkaloids, including atropine, scopolamine, and hyoscyamine. They cause hallucinations.
Cocaine is a stimulant while opioids are depressants. Stimulant drugs are substances that increase the activity of the central nervous system, resulting in increased alertness, wakefulness, and physical activity. Examples of stimulant drugs include caffeine, amphetamines, and cocaine. Depressant drugs, on the other hand, are substances that decrease the activity of the central nervous system, leading to a state of relaxation, sedation, or sleepiness. Examples of depressant drugs include opioids, alcohol, barbiturates, benzodiazepines, and opioids.