Nicotine cause failure of nervous system and commercially available as

Answer: Option A

Nicotine cause failure of nervous system and commercially available as Nicotine sulphate.
Nicotine is a naturally produced alkaloid in the nightshade family of plants and is widely used recreationally as a stimulant and anxiolytic.
Nicotine acts as a receptor agonist at most nicotinic acetylcholine receptors, except at two nicotinic receptor subunits (nAChRα9 and nAChRα10) where it acts as a receptor antagonist.
By binding to nicotinic acetylcholine receptors in the brain, nicotine elicits its psychoactive effects and increases the levels of several neurotransmitters in various brain structures.