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.
--------
Question: Category: FOREIGN CURRENCY 
Clue: It's the currency used in Curacao

Answer: dutch guilder


Question: Category: SIGNS & SYMBOLS 
Clue: Symbols of mystery, they're the mysterious doubles of the people who cast them

Answer: shadows


Question: Category: TAKE THE "A" TRAIN 
Clue: According to Genesis 4, he was the middle child

Answer:
abel