Question : Which of the four blood groups, A, AB, B and O, is called a universal donor?
Option 1: O
Option 2: A
Option 3: B
Option 4: AB
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Correct Answer: O
Solution : The correct answer is O .
The term universal donor refers to those with blood type O (especially O-). Because their red blood cells lack A and B antigens and the Rh factor (D antigen), they are considered universal donors. It indicates that substantial immunological reactions cannot be caused by transfusing their blood to recipients of different blood types.
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