If a clump is formed with anti A and anti B antisera the blood group is

Options

A. AB
B. A or B
C. O
D. A,B and AB

Answer

To determine the blood group based on the formation of a clump with anti-A and anti-B antisera, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Antisera**: Antisera are solutions containing antibodies that can react with specific antigens. Anti-A will react with A antigens, and anti-B will react with B antigens.

2. **Identify the Reaction**: If a clump is formed when blood is mixed with anti-A and anti-B antisera, it indicates that both A and B antigens are present on the surface of the red blood cells (RBCs).

3. **Determine the Blood Group**:
- If clumping occurs with anti-A, it means that A antigens are present.
- If clumping occurs with anti-B, it means that B antigens are present.
- Therefore, if clumping occurs with both anti-A and anti-B, the blood group must have both A and B antigens.

4. **Conclusion**: The blood group that has both A and B antigens is known as blood group AB. However, if no clumping occurs with either antisera, it indicates the absence of both A and B antigens, which corresponds to blood group O.

5. **Final Answer**: Since the question specifies that clumping occurs with both anti-A and anti-B antisera, the blood group is AB.