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
An example of chronic myeloproliferative disorder is 
Select and explain. 
A. Neutrophilic leukemoid reaction, B. Essential thrombocythemia, C. Plasmacytosis, D. Hairy cell leukemia
B: Essential thrombocythemia
Answer: B: Essential thrombocythemia 
Explanation: <p>According to WHO classification of myeloid neoplasms,the diseases under myeloproliferative group are chronic myeloid leukemia ,chronic neutrophilic leukemia ,chronic eosinophilic leukemia ,polycythemia vera & essential thrombocytopenia.</p><p>Reference :Harsh mohan textbook of pathology sixth edition pg no 357.</p>