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: Medicine
[{'content': 'The following are the myeloproferative disorders except- \nSelect and explain. \nA. Polycythemia vera, B. Essential thrombocytosis, C. Chronic myeloid leukemia, D. Hairy cell leukemia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hairy cell leukemia is a B-cell malignancy characteised by the presence of hairy cells in the blood & bone marrow & splenomegaly. Myeloproliferative diseases include chronic myeloid leukaemia ,polycythaemia vera, essential thrombocythaemia,chronic idiopathic myelofibrosis,chronic neutrophilic leukaemia ,chronic eosinophilic leukaemia .Reference :Harsh mohan textbook of pathology 6th edition pg no 357 & 378.', 'role': 'assistant'}]