Assertion : The region around a magnet where its magnetic influence is felt is called magnetic field.
Reason : Magnetic influence of a magnet is maximum at its centre.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "The region around a magnet where its magnetic influence is felt is called magnetic field."
- This is a true statement. The area surrounding a magnet where it can exert a magnetic force on other magnetic materials is indeed referred to as the magnetic field.

2. **Understanding the Reason**:
- The reason states that "Magnetic influence of a magnet is maximum at its centre."
- This statement is false. In fact, the magnetic influence (or magnetic field strength) is strongest at the poles of the magnet (the ends) and weakest at the center.

3. **Conclusion**:
- Since the assertion is true and the reason is false, we conclude that the assertion is correct, but the reason does not support the assertion.

4. **Final Answer**:
- The assertion is TRUE, and the reason is FALSE.