A) O
B) AB
C) B
D) A
Correct Answer: B
Solution :
On the basis of presence or absence of certain antigen, ABO blood group has been established in man by K Landsteiner. It was found that there can be two antigens A or B and as a result four blood groups. These blood groups are called ABO blood group or Landsteiner blood group.| Blood group | Antigen | Antibody for antigens |
| A | A | b |
| B | B | a |
| AB | A and B | none |
| O | none | a and b |
| Blood group of Donor | Blood Group of Recipient |
| A | A and AB |
| B | B and AB |
| AB | AB (universal recipient) |
| O (universal Donor) | O, A, B, AB |
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