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
Which of the following drug is not used in detrussor instability: 
Select and explain. 
A. Solefenacin., B. Flavoxate., C. Duloxetine., D. Tolterodine.
C: Duloxetine.
Answer: C: Duloxetine. 
Explanation: Duloxetine is an SSRI used for treatment of depression