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': 'Which of the following is a cause for autoimmune hemolytic anemia? \nSelect and explain. \nA. CLL, B. IMN, C. Sickle cell anemia, D. Both CLL & IMN', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In sickle cell anemia the hemolysis is due to structural defect in the B chain causing increased stickiness. It is not immune related.', 'role': 'assistant'}]