The blood group which is termed as Universal donor is

Options

A. `A^(+)`
B. `AB^(+)`
C. `B^(+)`
D. `O^(-)`

Answer

To determine which blood group is termed as the Universal Donor, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Blood Groups**: Blood groups are classified based on the presence of specific antigens on the surface of red blood cells (RBCs). The main blood groups are A, B, AB, and O.

2. **Identify Antigens**:
- Blood group A has antigen A.
- Blood group B has antigen B.
- Blood group AB has both antigens A and B.
- Blood group O has no antigens.

3. **Determine Compatibility**:
- Blood group A can donate to A and AB.
- Blood group B can donate to B and AB.
- Blood group AB can donate only to AB.
- Blood group O can donate to A, B, AB, and O.

4. **Identify the Universal Donor**:
- Since blood group O has no antigens, it does not trigger an immune response in recipients with any other blood group. Therefore, it can be safely donated to any blood type.

5. **Conclusion**: Based on the compatibility analysis, the blood group that is termed as the Universal Donor is O.

### Final Answer:
The blood group which is termed as Universal donor is **O**.

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