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: REALLY BIG 
Clue: Longer than 2 football fields, it was launched at Friedrichshafen, Germany in 1936

SOLUTION: the hindenburg

PROBLEM: Category: THE 19th CENTURY 
Clue: In 1825 patriots crossed the Rio de la Plata from Argentina to fight for this country's freedom from Brazil

SOLUTION: uruguay

PROBLEM: Category: WEATHER 
Clue: Still a scientific mystery, the ball type of this appears as a glowing sphere & has sometimes been seen in houses

SOLUTION:
lightning