DNA is present in or which one of the following has its own DNA?

Concept: Some cell organelles are endosymbionts, having evolved from an endosymbiotic mutualistic relationship. These organelles are semi-autonomous and can replicate on their own when necessary.

Because of independent DNA nuclei, mitochondrion, and chloroplast can replicate on their own. Mitochondria and chloroplast are known as semi-autonomous organelles. 

Hence, the correct answer is option D.