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': 'All are T cell lymphomas, EXCEPT: \nSelect and explain. \nA. Lymphoplasmacytic lymphoma, B. Mycosis fungoides, C. Anaplastic large cell lymphoma, D. Aggressive NK cell leukemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lymphoplasmacytic lymphoma is a B cell lymphoma, all others are T cell lymphomas. Ref:Harrisons principles of internal medicine 18th edition, Page: 920.', 'role': 'assistant'}]