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: Pathology
[{'content': 'Leucocyte alkaline phosphatase (LAP) is raised in all except \nSelect and explain. \nA. Myelofibrosis, B. Essential thrombocythemia, C. Polycythemia, D. Chronic myeloid leukemia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]