General Medicine General 871fc20c A 67 year old woman with a prosthetic aortic valve develops progressive anemia. Examination of a peripheral blood smear reveales reticulocytsis and schistocytes. What is the appropriate diagnosis A Aconthocytosis B Henoch - schonlein purpura C Idiopathic thrombocytopemic purpura D Macroangiopathic hemolytic anemia