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.

Category: THEY USED TO BE TEENAGERS 
Clue: By 1965 this teenage Austrian was so muscular he was named Junior Mr. Europe
arnold schwarzenegger

Category: IF THEY MARRIED... 
Clue: Ms. Khan, once the lead singer of Rufus, feels for Senator Trent & gets this sweet name
chaka lott

Category: SUPERHERO BEFORE & AFTER 
Clue: Flubberific Fred MacMurray film that leads the X-Men, albeit from his wheelchair

the absent-minded professor x