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': 'Thrombocytosis may be seen in the following conditions except - \nSelect and explain. \nA. Idiopathic myelofibrosis, B. Chronic myeloid leukemia, C. Essential thrombocythemia, D. Hypersplenism', 'role': 'user'}, {'content': "Answer: D \nExplanation: Reactive thrombocytosis is seen in chronic inflammatory disorders ,hemolytic anemia , malignant disease , tissue damage, post-splenectomy,post-hemorrhage . Clonal thrombocytosis is seen in primary thrombocythemia,polycythaemia rubra vera,chronic myeloid leukaemia ,myelofibrosis,myelodysplastic syndromes .Reference:Davidson's principles & practice of medicine 22nd edition pg no 1008", 'role': 'assistant'}]