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': 'A patient has the following findings -splenomegaly,low RBC count, normal WBC and platelet count and peripheral blood smear shows target cells. Repeated BM aspiration is unsuccessful. The probable diagnosis is - \nSelect and explain. \nA. Thalassemia, B. Chronic myeloid leukemia, C. Iron deficiency anaemia, D. Myelofibrosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]