Re: Sadly the wrong answer.
"Chiropractors don't have an M.D, they are "D.C."
Maybe where you live (the US?), but perhaps not true everywhere. If they apply the rule has "having an MD awarded anywhere in the world", it will be just a matter of time (if not the case already) that you can buy a "MD certificate" on-line from a dodgy jurisdiction.
The quacks might even justify this to themselves as a noble work around of rules set up by the evil Big Pharma establishment to keep them out.