What are the four human blood types in ABO blood group typing?
- A. AO, BO, A and B
- B. A, B, AB and O ✓
- C. A, AB, BO and O
- D. AB, AO, B and O
Correct Answer: B. A, B, AB and O
Explanation
The ABO blood group system classifies human blood into four major types based on the presence or absence of A and B antigens: A, B, AB, and O.
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