The antibodies present in the plasma of a person with blood group A will be

Options

A. anti-A
B. anti-B.
C. both (A) and (B) .
D. none of these .

Answer

To determine the antibodies present in the plasma of a person with blood group A, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Blood Group Antigens**: Blood groups are classified based on the presence or absence of specific antigens on the surface of red blood cells (RBCs). The two main antigens involved in the ABO blood group system are A and B.

2. **Identify Blood Group A**: A person with blood group A has A antigens on the surface of their RBCs.

3. **Determine the Corresponding Antibodies**: The immune system produces antibodies against antigens that are not present in the body. Therefore, since a person with blood group A has A antigens, they will produce antibodies against B antigens.

4. **Conclusion**: The antibodies present in the plasma of a person with blood group A will be Anti-B antibodies.

5. **Final Answer**: The correct option is "Anti-B".