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: Pathology
Mantle cell lymphoma are positive for all of the following except 
Select and explain. 
A. CD 20, B. CD 23, C. CD 5, D. CD 43
B: CD 23
Answer: B: CD 23 
Explanation: Solution
Mantle cell lymphoma are usually CD23 negative.
They are positive for CD5, CD 20, and CD43.