Which of the following alkaloids is used in a very dilute solution to dilate the pupils of the eyes?

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Atropine is an alkaloid obtained from the plant Atropa belladonna. It acts as a competitive antagonist for the muscarinic acetylcholine receptors. In ophthalmology, a very dilute solution of atropine is used as a mydriatic agent to dilate the pupils of the eyes for examination. Answer: Atropine