This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
Organelle having DNA is? 
Select and explain. 
A. Mitochondria, B. Golgi complex, C. SER, D. RER
A: Mitochondria
Answer: A: Mitochondria 
Explanation: Ans. A MitochondriaRef: Ganong 25th edition, page 36Mitochondria have their own genome and contain DNA. Human mitochondrial DNA has a circular double stranded molecule containing 16,500 base pairs compared to a billion in nuclear DNA. Mitochondria are derived from ovum, their inheritance is maternal. Since the repair mechanism of DNA is poor, mutation rate for mitochondrial DNA is 10 times more than nuclear DNA.