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

Category: HISTORIC ISLANDS 
Clue: A 900-year-old organization expelled in 1798 was allowed to return to this island in 1998
malta

Category: THE ENVIRONMENT 
Clue: Samples from a Swiss bog show the highest levels of this element in the past 14,000 years were from 1975 to 1982

lead