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 drug is: March 2013 (e) \nSelect and explain. \nA. Betamethasone, B. Atropine, C. Pilocarpine, D. Tropicamide', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D i.e. Tropicamide', 'role': 'assistant'}]