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
An example of chronic myeloproliferative disorder is - 
Select and explain. 
A. Neutrophilic leukaemoid reaction, B. Essential thrombocythaemia, C. Plasmacytosis, D. Hairy cell leukaemia
B: Essential thrombocythaemia
Answer: B: Essential thrombocythaemia 
Explanation: None