This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Myeloproliferative Disorder, Subject name: Pathology
[{'content': 'JAK -2 mutation is seen in? \nSelect and explain. \nA. Polycythemia Vera, B. I.T.P, C. C.M.L, D. C.M.M.L', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Polycyathemia VeraRef: Robbins pathology 9th ed/616JAK-2 Mutation is seen in:-* Polycythemia Vera* Primary myelofibrosis* Essential Thrombocytosis', 'role': 'assistant'}]