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: ANCIENT ROME 
Clue: This church faced periodic persecution for 300 years, until Constantine's conversion

SOLUTION: christian church

PROBLEM: Category: SHE WAS IN THAT? 
Clue: She was an extra in Charlie Chaplin's "City Lights" before she starred in "Platinum Blonde"

SOLUTION: jean harlow

PROBLEM: Category: "EAST" 
Clue: It was the capital city of the former German Democratic Republic

SOLUTION:
east berlin