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

SOLUTION: dowager

PROBLEM: Category: SCIENCE GRAB BAG 
Clue: A material called URhGe can be manipulated into being this, lacking electrical resistance

SOLUTION: superconductors

PROBLEM: Category: THE MOVIES 
Clue: In 1977 this "Happy Days" star directed his first feature, "Grand Theft Auto"

SOLUTION:
ron howard