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: Pathology
[{'content': 'All of the following conditions are associated with coombs positive hemolytic anemia, except: \nSelect and explain. \nA. Thrombotic Thrombocytopenic purpura (TTP), B. Scleroderma, C. SLE, D. PAN', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Thrombotic Thrombocytopenic purpura (TTP), shows coomb\'s negative microangiopathic hemolytic anemia. Ref: Amit Ghosh, MD (2010), Chapter 11, "Hematology: Benign Hematology", In the book, "Mayo Clinic Internal Medicine Board Review", 9th Edition, New york, Page 378; Harrison\'s Principles of Internal Medicine, 16th Edition, Page 612', 'role': 'assistant'}]