The DNA of the bacterium is present in distinct region called:

Explanation

The correct answer is nucleoid. In bacteria, which are prokaryotic organisms, the genetic material is located in a region known as the nucleoid. This region is not enclosed by a membrane, distinguishing it from the nucleus found in eukaryotic cells. The other options, such as the nucleolus, centrosome, and nucleus, refer to structures found in eukaryotic cells and are not applicable to bacteria.