MCQ
Which of the following statements is incorrect?
  • A
    A person of $’O\ ’$ blood group has anti $‘A\ ’$ and anti $‘B\ ’$ antibodies in his blood plasma.
  • B
    A person of $’B\ ’$ blood group cannot donate blood to a person of $’A\ ’$ blood group.
  • Blood group is designated on the basis of the presence of antibodies in the blood plasma.
  • D
    A person of $AB$ blood group is universal recipient.

Answer

Correct option: C.
Blood group is designated on the basis of the presence of antibodies in the blood plasma.
Blood groups are designated on the basis of antigen present on the surface of their $\text{RBCs}$. e.g., Person with blood group $A$ have antigen $A$ on surface of their $\text{RBCs}$ and antibody $B$ in plasma. Incompatibility during blood transfusion leads to reaction between antigens on the cells and antibodies in plasma, which produces clots that clog Human $\text{ABO}$ blood groups and their compatibility is shown as:
Blood group Geno type Antigens in Red Blood Corpuscles Antibodies in blood plama Can give blood to can get blood from
$A$ $\left|A\right|A$Or $\left|A\right|O$ $A$ $b$ $A,AB$ $A,O$
$B$ $\left.\left.\right|{\mathrm{B}}\right|{\mathrm{B}}$ Or $\left.\left.\right|{\mathrm{B}}\right|{\mathrm{O}}$ $B$ $a$ $B,AB$ $B,O$
$AB$ $\left.\left.\right|A\right|B$ $AB$ None $AB$ All
$O$ $\left.\left.\right|O\right|O$ None $a,b$ All $O$

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