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: CALIFORNIA DREAMIN' 
Clue: California produces approximately 98% of the U.S. supply of these "green almond" nuts

SOLUTION: pistachios

PROBLEM: Category: GREAT ALEXANDERS 
Clue: In 1990 Russia restored citizenship to this Nobel Prize-winning author of "Cancer Ward"

SOLUTION: aleksandr solzhenitsyn

PROBLEM: Category: ACTORS & THEIR ROLES 
Clue: He played a crime king in his last film, 1964's "The Killers"

SOLUTION:
ronald reagan