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': 'Which of the following drug is best used in urge incontinence? \nSelect and explain. \nA. Oxybutinin, B. Darifenacin, C. Flavoxate, D. Tolterodine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Darifenacin, solifenacin are uroselective drugs used in urge or urinary incontinence or overactive bladder .act by inhibiting M3 receptors Ref: Goodman Gillman 11th ed pg 231-232', 'role': 'assistant'}]