TASK DEFINITION: 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.
PROBLEM: Category: SOUTH AMERICA 
Clue: Alphabetically, they're the first & last of the 7 countries where the Andes are found

SOLUTION: argentina & venezuela

PROBLEM: Category: INVENTORS 
Clue: Mainz, Germany celebrates the life of this inventor in an annual festival called Johannisnacht

SOLUTION: johannes gutenberg

PROBLEM: Category: BEATLES SONGS 
Clue: The title of this Beatles song is a Yoruba phrase that means "life goes on"

SOLUTION:
\"ob-la-di, ob-la-da\"