TASK DEFINITION: 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.
PROBLEM: Category: CELEBRITY MEMOIRS 
Clue: "The Time Of My Life" is the memoir this late actor wrote with his wife Lisa Niemi

SOLUTION: patrick swayze

PROBLEM: Category: THE 1970s 
Clue: In 1977 Bank of America changed the name of its Bank Americard to this 4-letter word

SOLUTION: visa

PROBLEM: Category: ELEMENT NAMES 
Clue: In 1828 a Norse god thundered onto the periodic table in the name of this element, No. 90

SOLUTION:
thorium