Natural antibodies are absent for the antigen

Options

A. A
B. B
C. D
D. All the above

Answer

To solve the question "Natural antibodies are absent for the antigen," we need to analyze the blood groups and their corresponding antigens and antibodies. Here’s the step-by-step solution:

### Step 1: Understand Blood Groups
- Human blood is classified into different groups based on the presence of specific antigens on the surface of red blood cells. The main blood groups are A, B, AB, and O.

### Step 2: Identify Antigens and Antibodies
- **Blood Group A**: Has antigen A and produces anti-B antibodies.
- **Blood Group B**: Has antigen B and produces anti-A antibodies.
- **Blood Group AB**: Has both antigen A and antigen B, and does not produce any antibodies against A or B (i.e., natural antibodies are absent).
- **Blood Group O**: Has no antigens and produces both anti-A and anti-B antibodies.

### Step 3: Analyze the Question
- The question asks for which blood group has no natural antibodies against its own antigens. From our analysis, we see that blood group AB has no antibodies against A or B antigens.

### Step 4: Evaluate the Options
- Given the options (A, B, C, D), we need to determine which one corresponds to the blood group that has no natural antibodies:
- Option A: A
- Option B: B
- Option C: AB
- Option D: O

### Step 5: Conclusion
- The correct answer is **Option C (AB)**, as individuals with blood group AB do not produce antibodies against A or B antigens.

### Final Answer
- The correct answer is **C (AB)**.

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