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.
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Question: Category: THE REAL LAND OF OZ 
Clue: This party led Australia from 1983 to 1996, while a party of the same name was Britain's opposition

Answer: labor


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

Answer: dowager


Question: Category: THE BODY HUMAN 
Clue: Hardening of these main arteries of the head & neck can lead to a stroke

Answer:
carotid arteries