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: Medicine
A patient has the following findings-splenomegaly, low RBC count, normal WBC, and platelet count and peripheral blood smear shows tear drop cells. Repeated BM aspiration is unsuccessful. The probable diagnosis is: 
Select and explain. 
A. Thalassemia, B. Chronic myeloid leukemia, C. Iron deficiency anaemia, D. Myelofibrosis
D: Myelofibrosis
Answer: D: Myelofibrosis 
Explanation: Answer is D (Myelofibrosis) Presence of dry tap (unsuccessful aspiration), tear drop cells and splenomegaly all suggest a diagnosis of myelofibrosis.