This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Valvular hea diseases, Subject name: Medicine
Criteria for mitral valvotomy includes all except? 
Select and explain. 
A. Significant symptoms, B. Isolated mitral stenosis, C. Mobile non calcified valve, D. Left atrial thrombus
D: Left atrial thrombus
Answer: D: Left atrial thrombus 
Explanation: Mitral valvuloplasty -Dilatation of mitral annulus and will enhance the possibility of left atrial thrombus to embolise to systemic circulation. For critical MS- Balloon valvotomy is recommended to reduce PCWP and symptoms. In case of calcification of valve-Pliability of valves is reduced-Balloon Valvotomy is not recommended. For left atrial thrombus anti-coagulation using Warfarin is recommended.