Verified Answer :

In a  red blood cell, the control center is the nucleus. A mitochondria is not a nucleus. It is another organelle that produces energy for the cell.

The nucleus is an organelle found in eukaryotic cells which acts like the control center of the cell
. An example why it is the control center is because it tells each part of cell what to do inside cells
.

Non Example of nucleus is: Mitochandria
, which is the main genome of the organism and is found in the nucleus.