The blood groups A, B, AB and O are classified on the basis of the type of antigen present on

Options

A. RBC
B. WBC
C. Plasma
D. Thrombocytes

Answer

To answer the question regarding the classification of blood groups A, B, AB, and O based on the type of antigen present, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Blood Groups**: Blood groups are classified into four main types: A, B, AB, and O. Each blood group is determined by the presence or absence of specific antigens on the surface of red blood cells (RBCs).

2. **Identifying Antigens**:
- Blood group A has A antigens on the surface of its RBCs.
- Blood group B has B antigens on the surface of its RBCs.
- Blood group AB has both A and B antigens on the surface of its RBCs.
- Blood group O has no A or B antigens on the surface of its RBCs.

3. **Role of Antigens**: Antigens are molecules that can trigger an immune response. In the case of blood groups, they are crucial for determining compatibility for blood transfusions.

4. **Examining the Options**: The question provides four options: RBC, WBC, Plasma, and Thrombocyte. We need to identify where the antigens are located.
- **RBC (Red Blood Cells)**: This is where the antigens A and B are present.
- **WBC (White Blood Cells)**: These do not have blood group antigens.
- **Plasma**: Plasma contains antibodies, not antigens.
- **Thrombocyte (Platelets)**: These are involved in clotting and do not have blood group antigens.

5. **Conclusion**: Since the classification of blood groups A, B, AB, and O is based on the type of antigen present, and these antigens are found on the RBCs, the correct answer is **RBC (Red Blood Cells)**.

### Final Answer:
The blood groups A, B, AB, and O are classified on the basis of the type of antigen present on **RBC (Red Blood Cells)**.

---