Read the following statements about morphine and select the option :
I. It is opioid drugs which binds to specific opioid receptors present in our brain and gastrointestinal tract.
II. The chemical diacetylmorphine is called smack or heroine.
III. Heroine is obtained by acetylation of morphine, extracted from the latex of cannabis sativa plant.
IV. Heroin is a central nervous system stimulant and causes hallucination.