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.

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

A: dowager
****
Q: Category: ECONOMICS 
Clue: After deducting all expenses from your gross profit, you're left with this

A: net
****
Q: Category: DIRECT TO VIDEO 
Clue: This company offers a motivational tape for experienced users of its exercise ski machines

A:
nordictrack
****