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: Ans. is 'd' i.e., MyelofibrosisRepeated unsuccessful bone marrow aspiration clinches the diagnosis in our of myelofibrosis.o Aspiration of bone marrow is often unsuccessful in myelofibrosis because of extensive fibrosis of bone marrow (characteristic dry tap).", 'role': 'assistant'}]