You will be given a definition of a task first, then some input of the task.
Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

While watching a behind the scenes video on some of the visual effects in Black Swan, they show how some of the mirror effects are done and point out that a "hero plate" was used along with green screen: What exactly is a hero plate? And what is its purpose in filmmaking?
Output:
What is a "hero plate" and what is its purpose in filmmaking?