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.

Category: RANKS & TITLES 
Clue: Inheriting property & title from her deceased husband made Tz'u-hsi of China this kind of Empress
dowager

Category: LET'S TAKE A TRIP 
Clue: When this country broke away from Ethiopia in 1993, Haile Selassie Avenue in the capital became Harnet Avenue
eritrea

Category: LET'S BE BRIEF 
Clue: "2 shakes of" this animal's "tail" means instantaneous

lamb\'s tail