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.
--------
Question: Category: LABOR UNION PRESIDENTS 
Clue: This current union president was the youngest person ever to receive a star on the Hollywood Walk of Fame

Answer: melissa gilbert


Question: Category: WORLD HISTORY 
Clue: City that was the seat of government of the viceroyalty of New Spain

Answer: mexico city


Question: Category: OPERA 
Clue: The libretto for "William Tell" was in this language, the native tongue of neither the composer, Rossini, nor the subject

Answer:
french