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': 'All are indications for splenectomy, except : \nSelect and explain. \nA. Hereditary spherocytosis, B. Hairy cell leukemia, C. ITP, D. Chediak higashi syndrome', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]