This. Evolutionarily speaking, a pile of cells wanted to live as long as possible. They collectively chose to support the creation and ongoing maintenance of the “brain” organ. They all delegated their survival decisions for the whole collection of cells to just those in the brain. Your consciousness, possible by your brain, is the president. The whole of your body is your constituents. The body is depending on you to make good decisions so the body lives as long and as healthy as possible.