This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
[{'content': 'Shoest acting mydriatic is? \nSelect and explain. \nA. Tropicamide, B. Atropine, C. Phenylephrine, D. Hyoscine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Tropicamide REF: khurana 4th ed p. 68 shoest acting mydriatic - Tropicamide Only mydriatic and not cycloplegic - phenylephrine Used in children - Atropine', 'role': 'assistant'}]