Blood group AB has

Options

A. No antigen
B. No antibody
C. Neither antigen nor antibody
D. both antigens, but no antibody

Answer

To solve the question about blood group AB, we need to understand the characteristics of blood groups in the ABO system. Here’s a step-by-step breakdown of the 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 (RBCs). The ABO blood group system identifies four main blood types: A, B, AB, and O.

**Hint:** Remember that blood groups are determined by the presence of specific antigens on RBCs.

### Step 2: Identify Antigens and Antibodies
- **Antigens:** Substances that can trigger an immune response. In the ABO system:
- Blood group A has A antigens.
- Blood group B has B antigens.
- Blood group AB has both A and B antigens.
- Blood group O has no A or B antigens.

- **Antibodies:** Proteins in the plasma that react against antigens. For example:
- Blood group A has anti-B antibodies.
- Blood group B has anti-A antibodies.
- Blood group AB has no antibodies against A or B.
- Blood group O has both anti-A and anti-B antibodies.

**Hint:** Distinguish between antigens (on RBCs) and antibodies (in plasma).

### Step 3: Analyze Blood Group AB
For blood group AB:
- It has both A and B antigens on the surface of the RBCs.
- It does not contain any antibodies (anti-A or anti-B) in the plasma.

**Hint:** Focus on the fact that blood group AB has both types of antigens and lacks antibodies to prevent clumping.

### Step 4: Conclusion
Based on the above information, we can conclude that blood group AB has both A and B antigens but no antibodies in the plasma. This prevents agglutination (clumping) of RBCs, which is crucial for maintaining proper blood flow.

**Final Answer:** Blood group AB has both antigens but no antibodies.