This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neoplasm of Mature B & T Cells, Subject name: Pathology
[{'content': "Which of the following is not a B cell neoplasm? \nSelect and explain. \nA. Hairy cell leukemia, B. Mycosis fungoides, C. Mantle cell lymphoma, D. Burkitt's lymphoma", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Mycosis fungoides is a Mature T and NK cell neoplasm. Mature T and NK cell neoplasm T cell prolymphocytic leukemia Mycosis fungoides Sezary syndrome Aggressive NK - cell leukemia Systemic EBV 4 T - cell lymphoma of Childhood Adult T - cell leukemia/ lymphoma Follicular T - cell lymphoma', 'role': 'assistant'}]