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: In 1971 this future secretary-general was a candidate for the presidency of Austria
kurt waldheim

Category: 21st CENTURY WORLD LEADERS
Clue: "Big Love" meets "The West Wing"? Pres. Jacob Zuma, who presides over this country from Pretoria, has 3 wives
south africa

Category: ARCHAEOLOGY
Clue: The 1978 discovery of footprints in Tanzania showed that hominids may have been doing this 3.6 million years ago
waling upright