(A) Atropine is an alkaloid that acts as a muscarinic antagonist. It is extracted from the leaves and roots of the $Atropa$ $\text{belladonna}$ plant.

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(A) Atropine is an alkaloid that acts as a muscarinic antagonist. It is extracted from the leaves and roots of the $Atropa$ $\text{belladonna}$ plant. In ophthalmology, it is used as eye drops to dilate the pupil (mydriasis) and to paralyze the ciliary muscle (cycloplegia) during eye examinations.