If type A agglutinogens are present on the surface of RBCs of a person but type B are absent, then what type of agglutinin will be present in the plasma of this person?

Options

A. Anti-A
B. Anti-B
C. Nil
D. Both Anti-A and Anti-B

Answer

To determine the type of agglutinin present in the plasma of a person whose red blood cells (RBCs) have type A agglutinogens and lack type B agglutinogens, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Agglutinogens and Agglutinins**:
- Agglutinogens are substances (antigens) present on the surface of red blood cells (RBCs) that determine blood type.
- Agglutinins are antibodies present in the plasma that react against specific agglutinogens.

2. **Identifying the Blood Type**:
- In this case, the person has type A agglutinogens on their RBCs. This means their blood type is A.

3. **Determining the Corresponding Agglutinins**:
- For a person with type A blood, the immune system produces antibodies (agglutinins) against the absent agglutinogen. Since type B agglutinogens are absent in this individual, the plasma will contain anti-B agglutinins (antibodies).

4. **Conclusion**:
- Therefore, the type of agglutinin present in the plasma of this person is **anti-B**.

### Final Answer:
The plasma of this person will contain **anti-B agglutinin**.

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