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
The type of non hodgkins lymphoma with highest rate of gastrointestinal system involvement is: 
Select and explain. 
A. B cell chronic lymphocytic leukemia, B. Mantle cell lymphoma, C. Extranodal marginal zone B cell lymphoma of MALT type, D. Follicular lymphoma
C: Extranodal marginal zone B cell lymphoma of MALT type
Answer: C: Extranodal marginal zone B cell lymphoma of MALT type 
Explanation: Disease Median Age, years B Symptoms, % Bone Marrow Involvement, % Gastrointestinal Tract Involvement, % B cell chronic lymphocytic leukemia 65 33 72 3 Mantle cell lymphoma 63 28 64 9 Extranodal marginal zone B cell lymphoma of MALT type 60 19 14 50 Follicular lymphoma 59 28 42 4 Ref: Harrison, E-18,P-925