Which red blood cell antigen is used to classify a person as Rh positive?
Correct answer: C. D antigen
- A. A antigen
- B. B antigen
- C. D antigen
- D. H antigen
Explanation
Rh-positive blood has the D antigen on the red blood cell surface. A and B antigens determine the ABO group, whereas H antigen is not the basis of routine Rh classification.
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About Blood and Immunity
Blood and immunity covers plasma, red blood cells, white blood cells, platelets, haemoglobin, blood groups and haemostasis. It explains innate and adaptive defenses, antibodies, lymphocytes, inflammation, vaccination and immune memory, with a distinction between active and passive immunity and between antigen and antibody.
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