TASK DEFINITION: You are given an open-domain question from an open movie database. Your task is to provide an answer to that question. Try to only include the answer. Do not put it in a sentence.
PROBLEM: who's the writer of Prison?

SOLUTION: Ingmar Bergman

PROBLEM: who is the director that directed Dark City?

SOLUTION: William Dieterle

PROBLEM: who directed Nosferatu?

SOLUTION:
F.W. Murnau