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.

Category: ON THE COVER OF ROLLING STONE 
Clue: "Nothing Compares" to this singer seen on covers in 1990 & '91, & with even less hair in '92
sinead o\'connor

Category: THE 1980s 
Clue: In 1985 the PMRC wanted these labeled for "Parental Guidance" if they contained explicit lyrics
records

Category: THE U.S. CONGRESS 
Clue: We swear, the very first law passed by Congress concerned how these pledges were to be made

oaths of office