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: JOHN 
Clue: First Watergate judge
john sirica

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

Category: PLAYING DOCTOR 
Clue: Alan Alda was Emmy nominated for "ER", but he's slightly better known for playing this Korean War doctor

hawkeye pierce