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
Inoue balloon is used in treatment of ? 
Select and explain. 
A. ASD, B. Mitral stenosis, C. Mitral regurgitation, D. Patent foreman ovale
B: Mitral stenosis
Answer: B: Mitral stenosis 
Explanation: 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.