That's the 'alimentary canal' ... the whole path that food takes
between your body's intake and waste output.
A middle-aged woman known as SM blithely reaches for poisonous snakes, giggles in haunted houses and once, upon escaping the clutches of a knife-wielding man, didn't run but calmly walked away. Because of this brain damage, the woman knows no fear, the researchers found
I think a is the answer to that