What will happen if blood of 'B' group is given to a patient of group 'A'?

Options

A. Recipient dies due to clumping of RBC of transfused blood
B. Recipient dies due to clumping of RBC of his own
C. Recipient remains normal
D. None of these

Explanation

### Step-by-Step Solution:

1. **Identify Blood Groups**:
- Blood group 'A' has A antigens on the surface of its red blood cells and B antibodies in the plasma.
- Blood group 'B' has B antigens on the surface of its red blood cells and A antibodies in the plasma.

2. **Understand the Transfusion Process**:
- When blood group 'B' is transfused into a patient with blood group 'A', the B blood contains B antigens and A antibodies.

3. **Antibody-Antigen Reaction**:
- The A antibodies present in the blood group 'A' will recognize the B antigens from the transfused blood as foreign.

4. **Coagulation Reaction**:
- This recognition leads to an immune response where the A antibodies attack the B antigens, resulting in clumping (agglutination) of red blood cells.

5. **Consequences of Agglutination**:
- The clumping of red blood cells can block blood vessels and lead to serious complications, including hemolysis (destruction of red blood cells) and potentially death.

6. **Conclusion**:
- Therefore, if blood group 'B' is given to a patient of blood group 'A', it can lead to a severe transfusion reaction, which can be fatal.