A person with blood group A required blood. The blood group which can be given is

Options

A. A and B
B. A and AB
C. A and O
D. A, B, AB and O

Explanation

To determine which blood group can be given to a person with blood group A, we need to understand the ABO blood group system and the compatibility of blood transfusions.

### Step-by-Step Solution:

1. **Identify the Antigens and Antibodies**:
- Blood group A has A antigens on the surface of its red blood cells and produces anti-B antibodies.

2. **Compatibility with Other Blood Groups**:
- **Blood Group A**: A person with blood group A can receive blood from another person with blood group A because both have A antigens, and there is no reaction with anti-B antibodies.
- **Blood Group B**: A person with blood group B has B antigens and produces anti-A antibodies. If blood group B is transfused into a person with blood group A, the anti-A antibodies will react with A antigens, causing clumping (agglutination) and potentially leading to serious complications.
- **Blood Group AB**: A person with blood group AB has both A and B antigens. If blood group AB is given to a person with blood group A, the anti-B antibodies in the A blood group will react with the B antigens in the AB blood group, causing agglutination.
- **Blood Group O**: Blood group O has no A or B antigens. Therefore, it does not trigger any immune response in a person with blood group A, making it safe for transfusion.

3. **Conclusion**:
- The blood groups that can be safely given to a person with blood group A are:
- Blood group A (same type)
- Blood group O (universal donor)

Thus, the answer to the question is that a person with blood group A can receive blood from blood group A or blood group O.

### Final Answer:
The blood groups that can be given to a person with blood group A are **A and O**.

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