The question I asked is pretty much asking the same thing as what this guy is asking. I have provided the list which was answered and indicated the transcripts are not found on wiki so if someone wanted to manually find each NPC in game and test they could expand on this answer.
To be frank, unless someone tests every NPC in game you wont find the actual answer given the transcripts for swearing are prohibited.
This answer is probably the best he will get, but I have left it open and provided the resources and means for someone else to expand on my answer if they wish. I am sure if someone goes to that length it will be selected as the 'best' answer.
Check the link I provided.