This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood transfusion, Subject name: Pathology
Duffy antigen is associated with: 
Select and explain. 
A. Cluster of Differentiation 123 (CD123), B. Cluster of Differentiation 234 (CD234), C. Cluster of Differentiation 345 (CD345), D. Cluster of Differentiation 456 (CD456)
B: Cluster of Differentiation 234 (CD234)
Answer: B: Cluster of Differentiation 234 (CD234) 
Explanation: Duffy antigen/chemokine receptor (DARC), also known as Fy glycoprotein (FY) Associated with CD234 (Cluster of Differentiation 234) Duffy antigen is located on the surface of RBCs. Glycosylated membrane protein and a non-specific receptor for several chemokines. Receptor for the human malarial parasites Plasmodium vivax and Plasmodium knowlesi. Polymorphisms in this gene are the basis of the Duffy blood group system.