This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Medicine
[{'content': 'What procedure was most recently performed on this patient? \nSelect and explain. \nA. Mitral-valve repair, B. Pancreatectomy, C. Roux-en-Y gastric bypass, D. Thyroidectomy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer A. Mitral-valve repairThe peripheral-blood smear showed schistocytes, spherocytes, and polychromasia suggestive of hemolytic anemia. Following mitral-valve repair, some patterns of the regurgitant flow disturbances associated with high shear stress are responsible for the hemolysis. Transesophageal echocardiography in this patient showed a jet of mild transvalvular mitral regurgitation. The hemolysis resolved after mitral-valve replacement.', 'role': 'assistant'}]