This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Pathology
[{'content': 'All of the following are associated with coombs positive hemolytic anemia except - \nSelect and explain. \nA. Thrombotic thrombocytopenia purpura (TTP), B. Scleroderma, C. SLE, D. PAN', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Coombs is positive only in immune hemolytic anemias where there is hemolysis of RBCs by antibodies produced in the body which is the case in SLE ,PAN & Scleroderma. While in TTP hemolysis occurs due to trauma to RBCs due to Microangiopathic hemolysis, seen in TTP &HUS Ref Robbins 9/e pg 448-449', 'role': 'assistant'}]