This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Pathology
[{'content': 'A 50 years old male presents with massive spleenomegaly. His differential diagnosis will include, except - \nSelect and explain. \nA. CML, B. Polycythemia vera, C. Hairy cell leukemia, D. Aplastic anemia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In aplastic anaemia the lymph nodes,liver and spleen are generally not enlarged. Reference textbook of Pathology 7th edition author Harsha Mohan page number 302 in clinical features.', 'role': 'assistant'}]