Assertion : Most of the enzymes of oxidative decarboxylation are present in mitochondrial matrix.
Reason: ETS operates on inner membrane of mitochondria

Options

A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A and R are false

Answer

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 "Most of the enzymes of oxidative decarboxylation are present in the mitochondrial matrix."
- Oxidative decarboxylation refers to a type of reaction where carbon dioxide is removed from a molecule, and this process is primarily involved in the citric acid cycle (Krebs cycle).
- The enzymes involved in oxidative decarboxylation include:
- Pyruvate dehydrogenase
- Isocitrate dehydrogenase
- Alpha-ketoglutarate dehydrogenase
- These enzymes are indeed located in the mitochondrial matrix, where the citric acid cycle occurs.

2. **Understanding the Reason**:
- The reason states that "ETS (Electron Transport System) operates on the inner membrane of mitochondria."
- The electron transport chain is a series of complexes that facilitate the transfer of electrons and is crucial for ATP production.
- This process occurs on the inner mitochondrial membrane, which is specialized for this function.

3. **Evaluating the Truth of Assertion and Reason**:
- Both the assertion and the reason are true:
- The assertion is true because the enzymes for oxidative decarboxylation are located in the mitochondrial matrix.
- The reason is true because the electron transport system does indeed operate on the inner membrane of the mitochondria.

4. **Determining the Relationship**:
- The assertion and the reason are both true, but the reason does not explain the assertion. The presence of enzymes in the mitochondrial matrix is related to the citric acid cycle, while the electron transport system operates independently on the inner membrane.

5. **Conclusion**:
- Therefore, the correct answer is that both the assertion and reason are true, but the reason is not the correct explanation for the assertion.

### Final Answer:
- Both assertion and reason are true, but the reason is not the correct explanation for the assertion.