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': "Bone marrow involvement is maximum in which type of lymphoma? \nSelect and explain. \nA. B cell chronic lymphocytic lymphoma, B. Follicular lymphoma, C. Diffuse large B cell lymphoma, D. Burkitt's lymphoma", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bone marrow involvement is seen in 72% of B cell chronic lymphocytic lymphoma. Ref: Harrisons principles of internal medicine, 18th edition, Page: 926', 'role': 'assistant'}]