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.

[Q]: Category: ART 
Clue: Medieval artists gave triangular ones to the trinity, round to the angels & rectangular to living holy people
[A]: halos


[Q]: Category: REALLY BIG 
Clue: Longer than 2 football fields, it was launched at Friedrichshafen, Germany in 1936
[A]: the hindenburg


[Q]: Category: TOUGH BODIES OF WATER 
Clue: Half a mile long, in the 1840s it inspired an American literary classic
[A]:
walden pond