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
JAK -2 mutations is seen in 
Select and explain. 
A. I.T.P, B. Polycythemia Vera, C. C.M.L, D. C.M.M.L
B: Polycythemia Vera
Answer: B: Polycythemia Vera 
Explanation: JAK-2 Mutation is seen in:-
• Polycythemia Vera
• Primary myelofibrosis
• Essential Thrombocytosis