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': 'Which is the shoest acting mydriatic \nSelect and explain. \nA. Atropine, B. Homatropine, C. Tropicamide, D. Cyclopentolate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Tropicamide', 'role': 'assistant'}]