Answer:
The correct answer would be the nucleus.
The nucleus is the membrane-bound organelle usually present in all eukaryotic cells.
It is termed as the control center of the cell as it contains DNA (deoxyribonucleic acid) that is, the genetic content of the cell.
The DNA controls and directs all the activities of the cell. It gives instructions for the synthesis of mRNA which in turn codes for the synthesis of protein.