Assertion : The content of inner compartment of mitochondria is called matrix.
Reason : The outer membrane forms a number of infoldings called cristae.

Options

A. If both assertion and reason are true amnd 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 both assertion and reason are false.

Explanation

To solve the question regarding the assertion and reason related to mitochondria, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "The content of the inner compartment of mitochondria is called matrix."
- This is true. The inner compartment of the mitochondria, which is enclosed by the inner membrane, contains a fluid known as the matrix. The matrix is rich in enzymes and plays a crucial role in cellular respiration.

2. **Understanding the Reason**:
- The reason states that "The outer membrane forms a number of infoldings called cristae."
- This is false. The cristae are actually formed by the inner membrane of the mitochondria, not the outer membrane. The inner membrane has these infoldings to increase the surface area for biochemical reactions.

3. **Conclusion**:
- Since the assertion is true and the reason is false, we conclude that the correct answer to the question is that the assertion is true but the reason is false.

### Final Answer:
- The assertion is true, but the reason is false.