This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
The criteria for carrying out a mitral valvuloplasty includes all of the following except- 
Select and explain. 
A. significant symptoms, B. Isolated mitral stenosis, C. Mobile noncalcified valve, D. Left atrial thrombus
D: Left atrial thrombus
Answer: D: Left atrial thrombus 
Explanation: None