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
Bone marrow involvement is maximum in which type of lymphoma? 
Select and explain. 
A. B cell chronic lymphocytic lymphoma, B. Follicular lymphoma, C. Diffuse large B cell lymphoma, D. Burkitt's lymphoma
A: B cell chronic lymphocytic lymphoma
Answer: A: B cell chronic lymphocytic lymphoma 
Explanation: Bone marrow involvement is seen in 72% of B cell chronic lymphocytic lymphoma. Ref: Harrisons principles of internal medicine, 18th edition, Page: 926