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
All are markers of Mantle cell lymphoma except 
Select and explain. 
A. CD5, B. CD19, C. CD20, D. CD23
D: CD23
Answer: D: CD23 
Explanation: Answer is option 4, CD23 Immunohistochemical expression of CD23 and CD40 may identify prognostically orable subgroups of diffuse large B-cell lymphoma: a Nordic Lymphoma Group Study. Linderoth J1, Jerkeman M, Cavallin-Stahl E, Kvaloy S, Torlakovic E; Nordic Lymphoma Group Study. Author information Abstract PURPOSE: In search for subgroups of diffuse large B-cell lymphoma (DLBCL) with different histogenetic origin and prognosis, as has been described by gene expression profiling, we examined tumor specimens from 125 patients with DLBCL, uniformly treated by either cyclophosphamideAdriamycin-vincristine-prednisone or methotrexate, doxorubicin, cyclophosphamide, vincristine, prednisone, and bleomycin in a multicenter trial set by the Nordic Lymphoma Group 1989-1994.