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.

Q: Category: THE 16th CENTURY 
Clue: In the 1569 Union of Lublin, Zygmunt II united Lithuania & this country

A: poland
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Q: Category: U.S. CITY NICKNAMES 
Clue: Among the sobriquets used for this city are "Witchcraft City" & the "Paradise of New England"

A: salem, massachusetts
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Q: Category: DING DONG 
Clue: This children's song says, "Morning bells are ringing, ding dong ding, ding dong ding"

A:
"frère jacques"
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