You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: U.S. POLITICS 
Clue: This city has been the site of more major party presidential nominating conventions than any other
chicago

Category: FAMOUS FIRSTS 
Clue: In 1876 this man became the first person not to get a busy signal on the other end of a phone line
alexander graham bell

Category: THE UNITED NATIONS 
Clue: It's the largest country in Europe that is not a member of the United Nations

switzerland