The Prefronal cortex.
The prefrontal cortex is the part of the brain that makes us different from animals it makes us intelligent makes our desigions.
The hippocampus is a part of our brain that keeps our memories and and everything we learn is stored in the hippocampus. If your hippocampus is removed from your brain you will remember nothing even everything that happend about 30 seconds ago.
The amygala is a part of our brain that keeps our emotions and keeps our feelings.