Prostitution - nothing dishonest here, it's an upfront profession. I trust the lady before any of the other 3.
Politics - for dishonesty.....politicians probably beat out teh bankers, but not by much. bankers pay fines, politicians go to jail
Legal - not many lawyers are dihonest, unless they are politicians. A bunch of skeeves, but lets face, not generally not dishonest.
Journalism - in total, not much dishonesty here, but if you retitle to news media, then yea, may well exceed politicians. I'd trust a used car salesman before a newspaper writer.