A person with blood group-A has

Options

A. antigen-A and antibody -b
B. antigen-B and antibody-a
C. Both antibodies
D. no antibody and no antigen

Answer

To determine the characteristics of a person with blood group A, we need to analyze the antigens and antibodies present in their blood. Here’s a step-by-step solution:

### Step 1: Understand Blood Group Classification
Blood groups are classified based on the presence of specific antigens on the surface of red blood cells. The main blood group systems are A, B, AB, and O.

### Step 2: Identify Antigens in Blood Group A
A person with blood group A has A antigens on the surface of their red blood cells. This is a defining characteristic of blood group A.

### Step 3: Identify Antibodies in Blood Group A
In addition to A antigens, individuals with blood group A produce antibodies against B antigens. Therefore, they will have anti-B antibodies in their plasma.

### Step 4: Eliminate Incorrect Options
Now, let's analyze the options provided:
- **Option 1**: Antigen A and antibody B (Correct)
- **Option 2**: Antigen B and antibody A (Incorrect, as this would indicate blood group B)
- **Option 3**: Both antibodies A (Incorrect, as blood group A does not have anti-A antibodies)
- **Option 4**: Neither antibody nor antigen A (Incorrect, as blood group A has A antigens)

### Step 5: Conclusion
Based on the analysis, the correct answer is that a person with blood group A has A antigens and B antibodies.

### Final Answer
A person with blood group A has:
- Antigen: A
- Antibody: B

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