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: Medicine
Which of the following is NOT a myeloproliferative disease: 
Select and explain. 
A. Polycythemia rubra vera, B. Acute myeloid leukemia, C. Chronic myeloid leukemia, D. Essential thrombocytosis
B: Acute myeloid leukemia
Answer: B: Acute myeloid leukemia 
Explanation: Answer is B (Acute myeloid leukemia) The myeloproliferative disorders are characterized pathophysiologically by clonal expression of a multipotent hematopoitic progenitor cell with the overproduction of one or more of the formed elements of Blood. These disorders may transform into acute leukemia naturally or as a consequence of mutagenic treatment. Myeloproliferative disorders classically include: - Polycythemia veraQ - Idiopathic myelofibrosisQ - Essential thrombocytosisQ - Chronic myeloid leukemiaQ