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
[{'content': 'A patient presents with a platelet count of 700 × 109/L with abnormalitites in size, shape and granularity of platelets. WBC count of 12 × 109L, hemoglobin of 11g/dl and the absence of the Philadelphia chromosome. The most likely diagnosis would be- \nSelect and explain. \nA. Polycythemia vera, B. Essential thrombocythemia, C. Chromic myeloid leukemika, D. Leukemoid reaction', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]