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
[{'content': 'Massive splenomegaly is seen in all of the following conditions, Except: \nSelect and explain. \nA. Hairy cell leukemia, B. Myelofibrosis, C. CML, D. Hepatic vein obstruction', 'role': 'user'}, {'content': "Answer: D \nExplanation: Hepatic vein obstruction is associated with splenomegaly but not massive splenomegaly. Causes of massive splenomegaly: Chronic myeloid leukemia Lymphomas Hairy cell leukemia Myelofibrosis with myeloid Metaplasia Polycythemia vera Gaucher's disease Chronic lymphocytic leukemia Sarcoidosis Autoimmune hemolytic anemia Diffuse splenic hemangiomatosis Ref: Henry P.H., Longo D.L. (2012). Chapter 59. Enlargement of Lymph Nodes and Spleen. In D.L. Longo, A.S. Fauci, D.L. Kasper, S.L. Hauser, J.L. Jameson, J. Loscalzo (Eds), Harrison's Principles of Internal Medicine, 18e.", 'role': 'assistant'}]