Agglutination of erythrocytes of donor will occur if

Options

A. O is given to AB
B. O is given to A
C. O is given to B
D. B is given O

Answer

**Step-by-Step Solution:**

1. **Understanding Blood Groups and Antigens:**
- Blood groups are classified based on the presence or absence of specific antigens on the surface of erythrocytes (red blood cells).
- The main blood groups are A, B, AB, and O.
- Group A has antigen A and antibody anti-B.
- Group B has antigen B and antibody anti-A.
- Group AB has both antigens A and B, but no antibodies.
- Group O has no antigens but has both antibodies anti-A and anti-B.

2. **Identifying Agglutination:**
- Agglutination occurs when the antibodies in the recipient's blood react with the antigens on the donor's erythrocytes.
- If there is a mismatch between the donor's antigens and the recipient's antibodies, agglutination will occur.

3. **Analyzing the Given Blood Group Combinations:**
- If O (which has no antigens) is given to any blood group (A, B, or AB), there will be no agglutination because there are no antigens to react with the recipient's antibodies.
- However, if B (which has antigen B) is given to O (which has anti-B antibodies), agglutination will occur because the anti-B antibodies in O will react with the B antigens from the donor.

4. **Conclusion:**
- Therefore, agglutination of the erythrocytes of the donor will occur if B is given to O.

**Final Answer:**
Agglutination of the erythrocytes of the donor will occur if B is given to O.

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