This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Leukemia, Subject name: Medicine
Decreased leucocyte alkaline phosphatase is seen in- 
Select and explain. 
A. CML, B. AML, C. Polycythemiavera, D. Myelofibrosis
A: CML
Answer: A: CML 
Explanation: Ans. is 'a' i.e., CMLRemeber these two important cause of low leucocyte alkaline phosphataseo Chronic myeloid leukemia.o Paroxysmal nocturnal hemoglobinuria.Other conditions where leucocyte alkaline phosphatase might be decreasedo Aplastic anemiao Diabeteso Cirrhosis of livero Gouto Thrombocytopenic purpurao Hereditary hypophosphatasia