This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
[{'content': 'Shortest acting mydriatics: \nSelect and explain. \nA. Atropine, B. Homatropine, C. Tropicamide, D. Cyclopentolate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: (Ref: KDT, 8th ed. pg. 130)Agents which dilate the pupillary diameter in order to facilitate fundoscopy are known as mydriatics. These are anti-muscarinic class of drugs.Anti-muscarinic drugs used in ophthalmologyDrugDuration of Effect (days)Atropine7-10Scopolamine3-7Homatropine1-3Cyclopentolate1Tropicamide0.25 days (6 hrs)These agents have mydriatic as well as cycloplegic action both.Strongest cycloplegic is: AtropineCycloplegic agent of choice in child: Atropine (child age group has strong ciliary muscles)Cycloplegic agent of choice in adults: Tropicamide', 'role': 'assistant'}]