How does the Hh blood group system differ from the ABO blood group system in terms of antigen expression?

A The Hh system expresses antigens on red blood cells only, while the ABO system expresses antigens on both red and white blood cells
B The Hh system expresses antigens on all blood cells, while the ABO system expresses antigens on red blood cells only
C The Hh system requires an enzyme to express its antigens, whereas the ABO system does not ✓
D The Hh system is not related to the ABO system in terms of antigen expression

Explanation

The Hh blood group system requires the presence of an enzyme, fucosyltransferase, to express its antigens, whereas the ABO system does not require such an enzyme.

Source

Textbooks on transfusion medicine and blood banking
Hematology Hematology: Blood Grouping and Crossmatching Hematology: Blood Grouping and Crossmatching Medium MEDICAL Confidence: medium