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: COUNTRIES OF THE WORLD 
Clue: The 3 most populous countries, they added up to an estimated 2.42 billion people in 1996
china, india, & the usa

Category: PRESIDENTS 
Clue: Under an act passed in 1958, they became the first two former presidents eligible for a pension
harry s. truman & herbert hoover

Category: U.S. SYMBOLISM 
Clue: By a 1782 resolution, they represent valor; purity & innocence; and vigilance, justice & perseverance

red, white & blue