This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardio thoracic surgery  , Subject name: Surgery
[{'content': 'Inoue balloon is used in treatment of ? \nSelect and explain. \nA. ASD, B. Mitral stenosis, C. Mitral regurgitation, D. Patent foreman ovale', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Inoue-Balloon catheter is indicated for percutaneous transvenous mitral commissurotomy in patients with hemodynamically significant mitral valvular stenosis resulting primarily from commissural fusion of the mitral valve cusps.', 'role': 'assistant'}]