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.

Q: Category: ENGLISH USAGE 
Clue: Latin for "thus", this 3-letter word is put in brackets to indicate an error in a quote

A: sic
****
Q: Category: BRAND NAMES 
Clue: This brand of petroleum jelly was selling a jar a minute in the U.S. by the 1880s, & it's still a favorite

A: vaseline
****
Q: Category: ISMs 
Clue: The belief in the need to secure rights & opportunities for women equal to those of men

A:
feminism
****