This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drugs, Subject name: Ophthalmology
[{'content': 'Duration of cycloplegic by atropine in an adult: \nSelect and explain. \nA. 6 hours, B. 2-3 days, C. 7-10 days, D. 1-2 days', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) 7 - 10 daysRef.: A.K. Khurana 6th ed. 1573, Khurana 4th ed./146Cycloplegics and its duration of actionDrugDuration of Effect (days)Atropine7-10Scopolamine3-7Homatropine1-3Cyclopentolate1Tropicamidedays (6 hrs)', 'role': 'assistant'}]