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: SPORTS CHAMPIONS 
Clue: Winning in 1965 & 1966, he was the first man to win the Masters golf tournament in 2 consecutive years
jack nicklaus

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

Category: CURRENT WORLD LEADERS 
Clue: He's believed to be grooming his son Gamal to succeed him

hosni mubarak