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': 'Longest acting drug among the following drugs for over reactive bladder: \nSelect and explain. \nA. Oxybutynin, B. Trospium, C. Solifenacin, D. Flavoxate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Solefenacin is the longest acting drug from this group.\nGastro-intestinal tract\n\nAnticholinergic drugs decrease the motility, tone and secretions in the gastrointestinal\xa0tract.\n\n— Pirenzepine and telenzepine are selective M1 blockers useful in peptic ulcer disease.\n— Hyoscine, dicyclomine, propantheline, oxyphenonium and clidinium are useful as\xa0anti-spasmodic agents for the treatment of intestinal colic.\n— Darifenacin and solefenacin are selective M3 blockers useful for irritable bowel\xa0syndrome and overactive bladder.\nOxybutynin is shortest acting and solefenacin is longest acting drug from this\xa0group.\nMirabegron is a newer drug approved for overactive bladder. It acts by stimulating\xa0β3\xa0receptors.', 'role': 'assistant'}]