$A$ well-known analgesic drug is:

$LSD$ is obtained from

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.

$LSD$ is derived from which of the following?

Repeated use of drugs increases the tolerance level of which receptors in the body?

From which part is opium obtained?