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
Pancytopenia with spleenomegaly seen in all except - 
Select and explain. 
A. Aplastic anemia, B. Myelofibrosis, C. Hairy cell leukemia, D. Polycythemia vera
A: Aplastic anemia
Answer: A: Aplastic anemia 
Explanation: None