If a child can receive blood from all donors, he belongs to the blood group?

Analyze the question The question asks which blood group lets a person receive blood from all donors. That is the "universal recipient."

Explain the concept Blood groups are defined by the antigens on red blood cells and the antibodies in the plasma:

| Blood group | Antigens on red cells | Antibodies in plasma | |---|---|---| | A | A | anti-B | | B | B | anti-A | | AB | A and B | none | | O | none | anti-A and anti-B |

Transfusion reactions happen when the recipient's plasma antibodies attack antigens on the donor's red cells (agglutination).

Step-by-step solution

1. To receive blood from everyone (A, B, AB and O), the recipient must not have antibodies against A or B antigens.
2. Group A has anti-B, so it would reject B and AB blood.
3. Group B has anti-A, so it would reject A and AB blood.
4. Group O has both anti-A and anti-B, so it can only safely receive O blood.
5. Group AB has no anti-A or anti-B antibodies, so it can accept blood from all groups.

Answer Group AB is the universal recipient, which is option B.

Exam tip Remember: AB = "All Blood" can be received, while O = "Only" gives to all (universal donor). Group O is the universal donor and AB is the universal recipient. JAMB often tests both, so be careful not to mix them up.