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
A 50 years old male presents with massive splenomegaly. His differential diagnosis will include, except - 
Select and explain. 
A. CML, B. Polycythemia vera, C. Hairy cell leukemia, D. Aplastic anemia
D: Aplastic anemia
Answer: D: Aplastic anemia 
Explanation: None