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: Medicine
The typical movement of mitral valve calcification is 
Select and explain. 
A. Upwards and downwards, B. Couterclock wise, C. Side to Side, D. Circular
A: Upwards and downwards
Answer: A: Upwards and downwards 
Explanation: None