This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non Hodgkin Iymphoma, Subject name: Pathology
Mantle cell lymphoma are positive for all of the following except: 
Select and explain. 
A. CD 23, B. CD 20, C. CD 5, D. CD 19
A: CD 23
Answer: A: CD 23 
Explanation: Parameter CLL MCL SMZL/SL VL HCL FL PLL CD5 + + - - - - CD10 - -/+ - - + -/+ CD11c -/+ -/+ + + - + CD19 + + + + + + CD20 +(dim) +(bright) +(bright) +(bright) +(bright) +(bright) CD23 + -/+ -/+ - -/+ - CD79b - + - -/+ + + FMC7 - + + + + + Smlg +(dim) +(bright) +(bright) +(bright) +(bright) +(bright) CLL: Chronic lymphocytic leukemia ; MCL: Mantle cell lymphoma; SMZL/SL VL: Splenic marginal zone lymphoma/splenic lymphoma with villous lymphocytes; HCL: Hairy cell leukaemia; FL: Folliculsr lymphoma;