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: TIME 
Clue: In the Queen's English, the phrase "Time, gentlemen, please!" refers to this

A: the pub is about to close
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Q: Category: FICTIONAL BATTLES & WARS 
Clue: Juan Rico joins the mobile infantry to fight in the war against the invading alien "bugs" in this Heinlein novel

A: starship troopers
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Q: Category: MEDICINE 
Clue: Cystitis, an inflammation of this urinary organ, is usually caused by bacteria

A:
bladder
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