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
[{'content': 'The typical movement of mitral valve calcification is \nSelect and explain. \nA. Upwards and downwards, B. Couterclock wise, C. Side to Side, D. Circular', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]