I used to think that Nobel committee was made up of researchers around the world, and the Nobel dudes would just present it for a ceremony. Nope, it's really just people from one college who are picking these prizes.
No, it’s not people from one college. The members of the different committees are professors or scientists from various Swedish universities, and the Royal Swedish Academy which gives the awards doesn’t not only have Swedish members as far as I know.
Edit: It seems the committee for physiology and medicine is actually at Karolinska institutet, so in this case it was one college.