This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chronic Myelogenous Leukemia, Subject name: Pathology
[{'content': 'A 50 years old male presents with massive splenomegaly. His differential diagnosis will include all, except: \nSelect and explain. \nA. Chronic myeloid leukemia, B. Polycythemia rubra vera, C. Hairy cell leukemia, D. Aplastic anemia', 'role': 'user'}, {'content': "Answer: D \nExplanation: Diseases Associated with Massive Splenomegaly Chronic myelogenous leukemia Gaucher's disease Lymphomas Chronic lymphocytic leukemia Hairy cell leukemia Sarcoidosis Myelofibrosis with myeloid metaplasia Autoimmune hemolytic anemia Polycythemia vera Diffuse splenic hemangiomatosis", 'role': 'assistant'}]