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 consistency, answers should be in all lower cased letters.
--------
Question: Category: ART 
Clue: The "Thinker" guards the entrance to the Philadelphia museum devoted to this sculptor

Answer: rodin


Question: Category: TRANSPORTATION 
Clue: In the 19th century Gustavus Swift developed this type of railway car to preserve his packed meat

Answer: refrigerator car


Question: Category: SUPERSTITIONS 
Clue: In England it's considered good luck to see one of these somewhat sooty blokes on your wedding day

Answer:
chimney sweep