Task: Explanation
Input (English): Frederic Zelnik (17 May 1885 - 29 November 1950) was one of the most important producers-directors of the German silent cinema. He also appeared on screen as an actor. Question: Which film director also appeared on screen as an actor, Dziga Vertov or Frederic Zelnik? Answer: Frederic Zelnik
Output (English):  He also appeared on screen as an actor.