5 surgeons discussing who it's easier to operate on

So there's 5 surgeons talking about who is easier to work on.

One says well, it's electricians, because they are color coded inside.

The second says librarians, because they use the Dewie Decimal System to organize their insides.

The third says construction workers, cause they come with a good blueprint.

The fourth says accountant, because everything is in numerical order.

The last says no, you are all wrong, it's easiest to work on politicians. They have no spine, they have no guts, they have no heart, no brain, and no balls. On top of that, their head and their ass are interchangeable!