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
All are B cell marker except : 
Select and explain. 
A. >CD-15, B. >CD-19, C. >CD-21, D. >CD-24
A: >CD-15
Answer: A: >CD-15 
Explanation: CD-15 CD-15 It is expressed on neutrophils, eosinophils and monocytes hut not on platelets, lymphocytes and erythrocytes. The marker for mature B cell are CD 19 CD 20 CD 21 CD 22 CD 24