The organelle that would attack and destroy a foreign invader body in a cell is the lysosome.

Here's why:

* Lysosomes are the "recycling centers" of the cell: They contain powerful digestive enzymes that break down waste materials, worn-out organelles, and even foreign invaders like bacteria and viruses.

* Engulfing invaders: When a foreign body enters a cell, the lysosome can fuse with the vesicle containing the invader. The enzymes within the lysosome then break down the invader, effectively destroying it.

* Immune response: This process is part of the cell's immune response, helping to protect the cell and the organism from infection.

While lysosomes are the primary defense, other organelles like the endoplasmic reticulum and Golgi apparatus also play roles in processing and presenting foreign antigens to the immune system.