What is the primary function of Duffy antigen in red blood cells?

A To facilitate the entry of malaria parasites into the cell ✓
B To regulate the expression of other blood group antigens
C To act as a receptor for complement proteins
D To influence the binding of red blood cells to endothelial cells

Explanation

Duffy antigen acts as a receptor for Plasmodium vivax, allowing the parasite to enter the red blood cell.

Source

Blood Bank and Transfusion Medicine textbook
Hematology Hematology: Blood Components Hematology: Blood Components Medium MEDICAL Confidence: high