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
[{'content': 'Which of the following drug is not used in detrussor instability: \nSelect and explain. \nA. Solefenacin., B. Flavoxate., C. Duloxetine., D. Tolterodine.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Duloxetine is an SSRI used for treatment of depression', 'role': 'assistant'}]