This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'The mydriatic drug with sho duration of action is \nSelect and explain. \nA. Cyclopentolate, B. Tropicamide, C. Homatropine, D. Atropine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Tropicamide, is a medication used to dilate the pupil and help with examination of the eye. Specifically it is used to help examine the back of the eye. It is applied as eye drops. Effects occur within 40 minutes and last for up to a day.', 'role': 'assistant'}]