Name the part of the cell concerned with the following ?
Liberation of energy

Explanation

**Step-by-Step Solution:**

1. **Identify the Function**: The question asks for the part of the cell responsible for the liberation of energy.

2. **Recall Cell Organelles**: Consider the various organelles within a cell and their functions, particularly those involved in energy production.

3. **Focus on Mitochondria**: Recognize that mitochondria are known as the "powerhouse of the cell." They are specifically involved in energy production.

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