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
Which of the following drug is not used for the overactive bladder 
Select and explain. 
A. Duloxetine, B. Darifenacin, C. Oxybutynin, D. Flavoxate
A: Duloxetine
Answer: A: Duloxetine 
Explanation: 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 .