Assertion :- Mitochondrial lumen is distinctly divided into two aqueous compartments.
Reason:- Mitochondria remain enclosed by two membranes.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False
D. If both Assertion & Reason are false.

Answer

To analyze the given assertion and reason, we can break down the information step by step:

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Mitochondrial lumen is distinctly divided into two aqueous compartments."
- This refers to the fact that the mitochondria have two main compartments: the intermembrane space (between the inner and outer membranes) and the mitochondrial matrix (inside the inner membrane).

2. **Understanding the Reason**:
- The reason states that "Mitochondria remain enclosed by two membranes."
- Mitochondria are indeed surrounded by two membranes: an outer membrane and an inner membrane. The inner membrane is highly folded into structures known as cristae.

3. **Connecting Assertion and Reason**:
- The assertion is true because the mitochondrial lumen is divided into two compartments: the intermembrane space and the matrix.
- The reason is also true as mitochondria are enclosed by two membranes.
- Furthermore, the reason provides a correct explanation for the assertion because the presence of two membranes leads to the formation of the two distinct compartments within the mitochondria.

4. **Conclusion**:
- Both the assertion and the reason are true, and the reason correctly explains the assertion. Therefore, the correct option is that both the assertion and reason are true, and the reason is the correct explanation of the assertion.

### Final Answer:
Both assertion and reason are true, and reason is the correct explanation of assertion.