Universal recipient blood group `:-`

Options

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

Answer

### Step-by-Step Solution:

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

2. **Identifying Antigens and Antibodies**:
- Blood group A has A antigens and B antibodies.
- Blood group B has B antigens and A antibodies.
- Blood group AB has both A and B antigens and no antibodies against A or B.
- Blood group O has no A or B antigens but has both A and B antibodies.

3. **Rh Factor**: Blood groups can also be classified based on the presence of the Rh factor (Rhesus factor).
- If Rh factor is present, the blood group is Rh positive (e.g., A+, B+, AB+, O+).
- If Rh factor is absent, the blood group is Rh negative (e.g., A-, B-, AB-, O-).

4. **Universal Recipient Definition**: A universal recipient is a blood group that can receive blood from any other blood group without causing an immune reaction.

5. **Identifying the Universal Recipient**:
- The AB blood group does not have antibodies against A or B antigens, meaning it can accept A, B, AB, or O blood types.
- Among the Rh factors, AB+ (AB positive) can receive blood from any Rh positive or Rh negative blood group.

6. **Conclusion**: The universal recipient blood group is AB positive (AB+), as it can receive blood from all other blood types without any adverse reactions.

### Final Answer:
The universal recipient blood group is **AB positive (AB+)**.