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: Pathology
[{'content': 'JAK -2 mutations is seen in \nSelect and explain. \nA. I.T.P, B. Polycythemia Vera, C. C.M.L, D. C.M.M.L', 'role': 'user'}, {'content': 'Answer: B \nExplanation: JAK-2 Mutation is seen in:-\n• Polycythemia Vera\n• Primary myelofibrosis\n• Essential Thrombocytosis', 'role': 'assistant'}]