Haemoglobin of the human blood forms a stable complex compound with which of the following gas leading to death?

Which cell of immune system cause pore formation at the surface of the plasma membrane

‘Quartan fever' is caused by

The use of anti-histamine, adrenaline and steroids quickly reduces the symptoms of

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 excitatory neurotransmitter.
$d.$ Morphine is an effective sedative and pain killer.
Mark the option which includes both correct statement