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
Leucocyte alkaline phosphatase (LAP) is raised in all except 
Select and explain. 
A. Myelofibrosis, B. Essential thrombocythemia, C. Polycythemia, D. Chronic myeloid leukemia
D: Chronic myeloid leukemia
Answer: D: Chronic myeloid leukemia 
Explanation: None