Which of the following pair is not correctly matched?

Options

A. IgM- pentamer strongest antibody
B. IgG- universal antibody
C. IgA- secretory antibody
D. IgE- B- cell activator

Answer

To solve the question, we need to analyze each pair of antibodies and their descriptions to identify which one is not correctly matched.

### Step-by-Step Solution:

1. **Identify the Antibodies**: The antibodies mentioned are IgM, IgG, IgA, and IgE.

2. **Evaluate IgM**:
- Description: "Pentamer stronger antibody."
- Analysis: IgM is indeed a pentamer and is known for being one of the strongest antibodies in terms of agglutination and complement activation.
- Conclusion: This statement is correct.

3. **Evaluate IgG**:
- Description: "Universal antibody."
- Analysis: IgG is often referred to as the universal antibody because it can cross the placenta and provide passive immunity to the fetus.
- Conclusion: This statement is correct.

4. **Evaluate IgA**:
- Description: "Mother's milk."
- Analysis: IgA is present in mucosal areas and is indeed found in high concentrations in breast milk, providing immunity to infants.
- Conclusion: This statement is correct.

5. **Evaluate IgE**:
- Description: "Beta cell activator."
- Analysis: IgE is primarily involved in allergic reactions and the defense against parasitic infections. It is not known as a beta cell activator; instead, it is associated with mast cells and basophils in allergic responses.
- Conclusion: This statement is incorrect.

### Final Answer:
The pair that is not correctly matched is **IgE - Beta cell activator**.