Question

The most popular blood grouping is ABO grouping. O in this grouping refers to:

• A. Anti-A and anti-B are absent in plasma
• B. Antigens A and B are present on RBCs
• C. Antigens A and B are absent on RBCs
• D. Anti-A is present on RBCs

Answer 1

Answer:

C. Antigens A and B are absent on RBCs

• Blood group O is defined by the complete absence of both A and B antigens on the surface of red blood cells (RBCs), making it the "null" type in the ABO system.