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: Pharmacology
[{'content': 'Which is the shoest acting mydriatic- \nSelect and explain. \nA. Atropine, B. Tropicamide, C. Cyclopentaolate, D. Homatropine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Tropicamide o Tropicamide has quickest and briefest action amongst the anticholinergic mydriatics. o It is unreliable cycloplegic.", 'role': 'assistant'}]