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An accident victim needs urgent transfusion but their blood group is unknown. The group whose donor can safely give blood to a person of any group is which one?
AGroup A
BGroup AB
CGroup O
DGroup B
Answer & Solution
Correct answer: C. Group O
1. A transfusion is safe when the donor's RBC antigens are not attacked by the recipient's antibodies.
2. The universal donor must carry no A or B antigens on its RBC surface.
3. Option A (group A) carries antigen A, so it cannot go to a B or O recipient, a trap.
4. Option B (group AB) carries both antigens and is the universal recipient, not donor.
5. Option D (group B) carries antigen B, so it too cannot be given to everyone.
6. Only group O lacks both antigens, so its cells are not attacked by any recipient.
7. The universal donor is therefore group O, option C.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 14 Transportation in Plants and Circulation in Animals "Blood donation", p.218_
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