Which of the following pairs is correctly matched?

Read the following statements:
$a.$ Heroin,commonly called smack,is obtained by acetylation of morphine.
$b.$ Cocaine is obtained from the latex of Papaver somniferum.
$c.$ Dopamine is an excitatory neurotransmitter.
$d.$ Morphine is an effective sedative and painkiller.
Mark the option which includes both correct statements.

What are the effects of regular use of drugs or alcohol?

Which of the following drugs is used for patients suffering from insomnia and depression?

Which of the following is a white crystalline drug that acts as an analgesic and provides a sense of euphoria?

Cocaine is commonly called as $:-$