Which of the following blood groups enables a person to give blood to any person?

Options

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

Answer

To determine which blood group enables a person to give blood to any person, we need to understand the ABO blood group system and the Rh factor.

### Step-by-Step Solution:

1. **Understand Blood Groups**: The ABO blood group system consists of four main blood types: A, B, AB, and O. Each blood type is determined by the presence or absence of specific antigens on the surface of red blood cells.

2. **Identify Universal Donor**: The blood group O is known as the universal donor. This is because individuals with blood type O do not have A or B antigens on their red blood cells. Therefore, their blood can be given to individuals of any other blood type without causing an immune reaction.

3. **Consider Rh Factor**: In addition to the ABO blood group system, the Rh factor (positive or negative) also plays a role in blood transfusions. However, the presence of Rh factor does not change the fact that O type blood can be donated universally. O negative blood is considered the universal donor type because it lacks both A/B antigens and the Rh factor.

4. **Conclusion**: Therefore, the blood group that enables a person to give blood to any person is O (specifically O negative for universal compatibility).

### Final Answer:
The blood group that enables a person to give blood to any person is **O (O negative is the universal donor)**.

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