The blood group in which A and B antigens are absent

Options

A. O
B. A
C. B
D. AB

Answer

To determine the blood group in which both A and B antigens are absent, we can follow these steps:

### Step-by-Step Solution:

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

2. **Identify Antigens**:
- **Blood Group A**: Contains A antigens and has antibodies against B (anti-B).
- **Blood Group B**: Contains B antigens and has antibodies against A (anti-A).
- **Blood Group AB**: Contains both A and B antigens and has no antibodies against A or B.
- **Blood Group O**: Contains no A or B antigens and has antibodies against both A and B (anti-A and anti-B).

3. **Analyze Each Blood Group**:
- **Group O**: No A or B antigens are present.
- **Group A**: A antigen is present.
- **Group B**: B antigen is present.
- **Group AB**: Both A and B antigens are present.

4. **Conclusion**: Since the question asks for the blood group where both A and B antigens are absent, the only group that fits this description is **Group O**.

### Final Answer:
The blood group in which A and B antigens are absent is **Group O**.

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