Final answer:
The drug that acts via a ligand-gated channel from the given options is Vecuronium, which is a neuromuscular blocker acting on nicotinic acetylcholine receptors.
Step-by-step explanation:
The question asks which of the following drugs acts via a ligand-gated channel. Ligand-gated channels are a type of ion channel that opens in response to the binding of a chemical messenger, or ligand, such as a neurotransmitter. Among the options provided, Vecuronium is a neuromuscular blocker that acts at the nicotinic acetylcholine receptors, which are examples of ligand-gated ion channels, leading to muscle relaxation. Therefore, the correct answer is D. Vecuronium.
A ligand-gated channel is a type of ion channel that opens or closes in response to the binding of a specific molecule, known as a ligand. Among the given options, Salbutamol acts via a ligand-gated channel.