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 and Antibodies**:
- The ABO blood group system consists of four main blood groups: A, B, AB, and O.
- Each blood group has specific antigens present on the surface of red blood cells (RBCs) and corresponding antibodies in the plasma.

2. **Identify Antigens in Blood Group A**:
- A person with blood group A has antigen A on the surface of their RBCs.

3. **Identify Antibodies in Blood Group A**:
- The plasma of a person with blood group A will contain antibodies against the antigens not present in their blood group.
- Since blood group A has antigen A, it will produce antibodies against antigen B.

4. **Conclusion**:
- Therefore, the antibodies present in the plasma of a person with blood group A are **antibody B**.

### Final Answer:
The antibodies present in the plasma of a person with blood group A will be **antibody B**.

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