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': "All are B cell lymphomas except - \nSelect and explain. \nA. Burkitt's lymphoma, B. Mycosis fungoides, C. Mantle cell lymphoma, D. Follicular cell lymphoma", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Mycosis fungoides is a slowly evolving cutaneous T cell lymphoma occuring in middle aged adult males. Burkitt lymphoma is a mature B cell malignancy Mantle cell lymphoma arise from the B cells of mantle zone of normal lymphoid follicle . Reference : Harsh Mohan textbook of pathology, 7th edition.Pg no.348,356,357,358,359 Follicular cell lymphoma is a mature B cell malignancy.', 'role': 'assistant'}]