This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasympathetic System & Glaucoma, Subject name: Pharmacology
[{'content': 'Shoest acting mydriatic and cycloplegic drug is \nSelect and explain. \nA. Hyoscine, B. Homatropine, C. Tropicamide, D. Cyclopentolate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Tropicamide is the shoest acting mydriatic ANTICHOLINERGIC DRUGS FOR EYE Atropine, homatropine, cyclopentolate and tropicamide are used as mydriatic and cycloplegic agents. Mydriatic action is useful in fundus examination whereas cycloplegic action allows correct assessment of refractive error Pain in iridocyclitis occur due to spasm of ciliary muscle which can be relieved due to cycloplegic action. Atropine has very long duration of action (3-5 days) in the eye Tropicamide is the shoest acting mydriatic. Anticholinergic agents are contra-indicated in glaucoma.', 'role': 'assistant'}]