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: UNDER THE "C" 
Clue: Cheese is this part of milk separated from the whey

SOLUTION: the curd

PROBLEM: Category: THE 20th CENTURY 
Clue: This 26-year-old lowland gorilla fielded questions during an April 1998 internet chat

SOLUTION:
koko