Mitochondria is the chemical factory of the cell.

Concept: The above-given statement is true.

• The "Mitochondria" is the cell's chemical manufacturing units. Most eukaryotic creatures have a double-bound membrane that is semi-autonomous. 
• The majority of the cell's ATP (adenosine triphosphate) supply, which is mostly used as chemical energy, is produced by it. 
• As a result, it is also referred to as the cell's engine. 
• The primary functions of mitochondria are to make ATP and control cellular energy through the respiration process.

Hence, option A is the correct answer.