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
Leucocyte common antigen 
Select and explain. 
A. CD 14, B. CD 15, C. CD 23, D. CD 45
D: CD 45
Answer: D: CD 45 
Explanation: Antigen DesignationNormal Cellular DistributionCD14MonocytesCD15Granulocytes; Reed-Sternberg cells and variantsCD23Activated mature B cellsCD45All leukocytes; also known as leukocyte common antigen(LCA)Ref: Robbins and Cotran Pathologic Basis of Disease; 9th edition; Chapter 13; Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus; Page no: 590