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 not used for the overactive bladder \nSelect and explain. \nA. Duloxetine, B. Darifenacin, C. Oxybutynin, D. Flavoxate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Refer Goodman and Gilman 12e 231,232 Anticholinergic drugs are indicated for overactive bladder and darifenacin, solefenacin,oxybutynin,tolterodine and fesoteradine are commonly used for this condition .', 'role': 'assistant'}]