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: __E__E__E 
Clue: A form of address for some royalty, it means calm & unruffled
[A]: serene


[Q]: Category: SIGNS & SIGNALS 
Clue: The ringing of the church bells on this holiday in 1572 was the signal to massacre Huguenots
[A]: st. bartholomew\'s day


[Q]: Category: AS QUICK AS YOU CAN SAY... 
Clue: Speedy plural term for a quickly-moving section of a river
[A]:
rapids