The most popular blood grouping is ABO grouping. O in this grouping refers to:
AAnti-A and anti-B are absent in plasma
BAntigens A and B are present on RBCs
CAntigens A and B are absent on RBCs
DAnti-A is present on RBCs
AAnti-A and anti-B are absent in plasma
BAntigens A and B are present on RBCs
CAntigens A and B are absent on RBCs
DAnti-A is present on RBCs
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